i inc 28 monitor manual
Submitted by flotaganis on July 6, 2022 - 8:36pmi inc 28 monitor manual
LINK 1 ENTER SITE >>> Download PDF
LINK 2 ENTER SITE >>> Download PDF
File Name:i inc 28 monitor manual.pdf
Size: 3417 KB
Type: PDF, ePub, eBook
Category: Book
Uploaded: 6 May 2019, 22:43 PM
Rating: 4.6/5 from 555 votes.
Status: AVAILABLE
Last checked: 14 Minutes ago!
In order to read or download i inc 28 monitor manual ebook, you need to create a FREE account.
eBook includes PDF, ePub and Kindle version
✔ Register a free 1 month Trial Account.
✔ Download as many books as you like (Personal use)
✔ Cancel the membership at any time if not satisfied.
✔ Join Over 80000 Happy Readers
i inc 28 monitor manualSocket-outlet shall be near the equipment and shall be accessible. Trademark Notice: I-INC products incorporate High-Definition Multimedia Interface (HDMI ) technology. HDMI, the HDMI Logo, and High-Definition Multimedia Interface are trademarks or registered. Due to the nature of the fluorescent light, the screen may flicker during initial use.The other control buttons are located on the front panel of the monitor (See Figure 4). By changing these settings, the picture can be adjusted to your personal preferences. Orange — Power Saving mode.Adjust the contrast value of the display according to your preference.It allows the monitor to inform the host system of its identity and, depending on the level of DDC used, communicate additional information about its display capabilities. HDMI, the HDMI Logo, and High-Definition Multimedia Interface are trademarks or registered. Due to the nature of the fluorescent light, the screen may flicker during initial use.The other control buttons are located on the front panel of the monitor (See Figure 3). You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Please protect yourself and others by following them. This warranty does not apply to expendable or consumable parts whose normal life expectancy is less than one (1) year such as, but not limited to, non-rechargeable batteries, sensor elements, filter, lamps, fuses etc. The Seller shall be released from all obligations under this warranty in the event repairs or modifications are made by persons other than its own or authorized service personnel or if the warranty claim results from physical abuse or misuse of the product. No agent, employee or representative of the Seller has any authority to bind the Seller to any affirmation, representation or warranty concerning the goods sold under this contract.https://fedmadtm.com/fmtm2009/cronicas/file/coolpix-e5700-manual.xml
- Tags:
- i inc 28 monitor manual, i inc 28 monitor manual pdf, i inc 28 monitor manual user, i inc 28 monitor manual transfer switch, i inc 28 monitor manual transmission.
Seller makes no warranty concerning components or accessories not manufactured by the Seller, but will pass onto the Purchaser all warranties of manufacturers of such components.It cannot measure the concentration of toxic gases or vapors in steam or inert or oxygen-deficient atmospheres. Neither will it indicate the presence of explosive or combustible mists or sprays, lubrication oils, nor explosive dusts, such as grain or coal dust. 4. As with all gas detection instruments of this type, high levels of or long exposure to certain compounds - all of which are not known, will contaminate the sensor. Calibrate the monitor frequently to ensure that system operation is dependable and its indications accurate. 5. The Toxgard II monitor must not be painted. Also, painting should not be done near the sample line inlet. If painting is being done in an area where the sample line inlet is located, care must be exercised to make sure that paint is not deposited on the sample inlet fitting of the monitor. Such paint deposits would interfere with the sampling process, whereby a sample of the atmosphere being monitored is drawn into the Toxgard II unit. 6. The only absolute method to ensure proper overall operation of a gas detection instrument is to check it with a known concentration of the gas for which it has been calibrated. Consequently, a calibration check should be included as part of the routine inspection of the system. 7. The sensor is a sealed unit which contains an electrolyte. Should the sensor develop leakage, it should be immediately removed from the sensing head and properly discarded in accordance with local, state and federal laws. Get immediate medical attention if electrolyte contacts skin or eyes. Perform periodic leak check on the sample line and all flow system components and fittings of the Toxgard II monitor. 9. Use only genuine MSA replacement parts when performing any maintenance procedures provided in this manual.http://dichthuatanhduy.com/uploads/userfiles/dr-605-manual.xml Failure to do so may seriously impair instrument performance. Repair or alteration of the Toxgard II unit, beyond the scope of these maintenance instructions, or by anyone other than an authorized MSA serviceman, could cause the product to fail to perform as designed, and persons who rely on this product for their safety could sustain severe personal injury or death. 10. Properly vent the exhaust of the Toxgard II monitor to a safe area. Improper venting of the exhaust can cause personal injury or death. 11. Do not install additional filters into the sample inlet fittings. Adding the filters will impair instrument performance. 12. Ensure the gas sample and Toxgard II unit are at the same temperature; otherwise, condensation will form, possibly clogging or filling the sample line. 13. Do not mix units with different area classifications. All units used in a classified area must have the proper area classification. Otherwise, an explosion hazard exists, resulting in possible explosion, injury or death.General Description The Toxgard II Monitor is an easy-to-use, low-cost, one-sensor monitor. Combustible gas models require the remote explosion-proof sensor module. To determine your sensor type and options, check the shipping carton (FIGURE 1-3) and sensor ID label. Checked items are included in the carton. Identifying Your Unit To determine your model type and other installed options (FIGURES 1-1 and 1-4), check the ID label on the shipping carton (FIGURE 1-3). The Toxgard II Monitor or Remote Sensing Module should be installed at a high level (ceiling), breathing level or low level (floor), depending on the density of the gas being monitored. The general-purpose Toxgard II Monitor can be a source of ignition and must not be mounted in an area where a flammable mixture of combustible gas and air may be present; otherwise, an explosion may occur.http://www.raumboerse-luzern.ch/mieten/bosch-manual-call-point Mount the Toxgard II Monitor or the Remote Sensing Module with its sensor inlet fitting (FIGURE 1-1 or 1-2) pointed downwards; otherwise, the inlet may become clogged with particulate matter or liquids. Do not paint the Toxgard II Monitor. If 1-4 painting is done in an area where a sensor is located, exercise CAUTION to ensure paint is not deposited on the sensor inlet fitting. Such paint deposits would interfere with the diffusion process, whereby a sample of the monitored atmosphere diffuses into the sensor. Do not mount the sensing head in direct sunlight as this may cause the sensor to overheat. Ventilation patterns must be established before positioning the Toxgard II unit or sensor assembly. Using suitable hardware (not supplied), mount the Toxgard II monitor to any flat surface via its four mounting lugs (see FIGURE 1-6). Allow sufficient room to open the unit front door. Gas Sampling Options Although the Toxgard II unit normally operates in the diffusion mode (i.e., gases or vapors to be detected enter the sensor input by natural molecular diffusion), a sample can be drawn into the instrument if the DC pump or air aspirator option was purchased. The Toxgard II Monitor cannot be installed in a hazardous area. Otherwise, an explosion hazard will exist, resulting in a possible explosion, injury or death. With the above gases, do not use an end-of-line filter. The sample line should be inspected periodically and replaced if dirty. Do not attempt to clean the sample line by applying compressed air. Any leak will dilute the gas sample from the area of interest and give a lower than actual gas reading. Avoid any sharp bends or elbows. NOTE: Exhaust to a safe or non-hazardous area only. 5. Check for leaks along entire length of the exhaust tubing line. 1-8 Blocked Flow Detection of Sample Line Units equipped with the pump or air aspirator options are supplied with a flow detector.http://gerrim.com/images/bush-tv-manuals.pdf This flow detector activates the fault relay when insufficient flow exists for proper gas detection. Do not mount the sensing head in direct sunlight as this may cause the sensor to overheat. 1. Using suitable hardware (not supplied) mount the Toxgard II monitor to any flat surface; allow room to open the door. 2. Connect the source of compressed air being monitored to the pressure regulator (fittings not included). Flow Block The Toxgard II Monitor equipped with the flow block option can be used to allow a sample to be delivered from a pressurized stream to the Toxgard II unit. Route this tubing to the Toxgard II Monitor, ensuring there are no kinks, leaks or other obstructions. The Protective Earth conductor shall be applied first and secured independently to the enclosure’s ground stud, nearest to Power Entry Opening, as shown in the image below. Alarm Features There are alarm levels in the Toxgard II unit, and a relay for each level. These contacts remain closed as long as: Upon activation, the relay contacts open to interrupt the electrical path. Relay Wiring with Inductive Loads If you are connecting the relays to motors, fluorescent lighting or other inductive loads, it is necessary to suppress any sparks that may occur at the relay contact. These sparks will deteriorate or destroy the relay contacts, rendering the relay inoperative or useless. The standard unit is supplied with a non-isolated, 4-20 mA signal. All that is additionally required if this option is selected, is a network communications board and a twisted-pair connection to the network. Make wiring connections and conduit runs according to accepted commercial wiring practices. Before removing the cover of an explosion-proof Toxgard II Remote Sensor Module, verify that the surrounding area does not contain a flammable mixture of combustible gas and air, since a source of ignition is exposed; otherwise, an explosion may occur if a metal object contacts the circuitry and produces sparks.https://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16297a633634b6---Computer-appreciation-manual.pdf Toxgard II Remote Sensor Modules (excluding the combustible models) are supplied with 50 feet of cable. The other end of the cable can be cut to the exact length needed. The combustible Remote Sensor Module is wired with a threeconductor cable. This cable can be acquired locally. Do not splice additional cable to the supplied cable or run more than 50 feet of user-supplied cable. If there is a possibility of electrical interference from external sources (such as large motors, welders, electrical heaters, etc.) use shielded cable. The preferred colors of conductors within the cable are black (K), green (G) and white (W). If splices are necessary, solder and insulate each conductor; then, wrap entire splice with suitable electrical tape or covering. The cable must be routed through conduit. Oxygen and Toxic Remote Sensor 2. Route the cable from the Toxgard II Monitor through the conduit opening and wire it to the terminal block in the bottom of the sensor. NOTE: Separate the power and ground wiring from any signal wiring. 3. Verify the identity of each conductor of the cable and connect the wire to the terminal block so that position 1 in the sensor is wired to position 1 on the Toxgard II Monitor TB2.Oxygen Remote Sensor Wiring Fifty feet of four-conductor cable is supplied with the unit. Do not run more than 50 feet of cable or splice on any additional cable. Note that there are four wires needed out of the six within the cable. Since a source of ignition is exposed, an explosion may occur if a metal object contacts the circuitry and produces sparks in an atmosphere of combustible gas. Pump Wiring (FIGURE 1-13) Dip Switch Settings Many of the Toxgard II features can be set with the SW2 and SW3 Dip Switches located on the main monitor printed circuit board (FIGURE 1-1). TABLES 1-5 and 1-6 show the positions for user-selectable settings (FIGURE 1-5): Table 1-5.BARTONSTEEL.COM/tony/barton/ckfinder/userfiles/files/cara-reset-printer-epson-c90-manual.pdf SW2 Switch Settings NOTE: LEFT side of each SW2 Dip Switch indicates the ON position and RIGHT side of each SW2 Dip Switch indicates the OFF position. These devices can be used to set various parameters in the Toxgard II Monitor, including alarm conditions, auto calibration configuration, etc. The devices can also be used for calibrating the Toxgard II Monitor. Internal Push-buttons A pair of internal push-buttons on the Toxgard II main pc board, lowerright corner (FIGURE 1-1) can be used in place of the Ultima Controller and Calibrator for most functions. Viewing Configuration Parameters At initial installation, use the Toxgard II MODE push-button (FIGURE 1-1) to review the Toxgard II configuration parameters. To scroll, press and release the MODE push-button. NOTE: Pressing and releasing the MODE push-button within 10 seconds enables the user to scroll to the next parameter. If the user does not press the push-button within 10 seconds, the Toxgard II Monitor ends the parameter viewing mode and returns to a display of the actual gas measurement. 1-27 The Toxgard II Monitor is able to detect and notify the user of a hazardous condition even while scrolling the parameters. Although the LED continues scrolling, the hazardous condition is noted by the horn, relays and strobes (if equipped). Once in the Parameter Setting Mode: 1. Use the MODE button to change the displayed value. 2. Use the CAL button to accept and save the displayed setting. No network communications, peripheral communications, or alarm updates occur in this mode. When the unit returns to normal operation: Use the MODE button to display and verify the settings.https://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16297a644d158b---computer-appreciation-tutorial-manual.pdf Battery Backup The Toxgard II Monitor can be configured with an (internal) rechargeable backup battery that permits full instrument operation if main power is interrupted or the Toxgard II Monitor is used as a transportable instrument for temporary gas monitoring of an area; the carrying handle and side-mount sensor are convenient options if the 1-30 Toxgard II Monitor is used as a transportable gas monitor. Transfer to the backup battery is automatic when main power loss occurs. TABLE 1-7 can be used as an approximation of expected battery operating time. During battery operation, the Toxgard II unit monitors backup battery voltage. NOTE: The Toxgard II battery pack requires up to 24-30 hours of uninterrupted main power to fully charge. NOTE: Normally, the unit automatically transfers power to the optional backup battery when the main power is lost. However, if the user wants to start the unit from an unpowered state using the battery, press SW6 on the main printed circuit board (FIGURE 1-13). Banshee Horn Audible Settings The Banshee Horn can produce several distinctly different sounds. NOTE: Record the position of the RED and BLACK wires connecting the horn to TB12 on the Toxgard II Monitor main pc board. When this procedure is complete, return these wires to their original positions. 1-32 3. Remove the four screws from the face of the horn. 4. Carefully separate the body halves of the horn. 5. To change the sound of the Banshee Horn, move the push-on jumper to the position to provide the desired sound (FIGURE 1-14). NOTE: The internal horn label shows which sound corresponds with each position. Figure 1-13. Banshee Horn Audible Settings 6. To change the volume of the Banshee Horn, use a small, flat screwdriver to adjust the volume control shown on FIGURE 1-14. Duct-Mounted Remote Sensor Installation Refer to Appendix A for this option. 1-34 Chapter 2, Start-up Initial Start-up The Toxgard II Monitor is factory-calibrated and ready for immediate use.http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16297a646cb203---Computer-architecture-a-quantitative-approach-4th-edition-solutions-manual.pdf Its range and output are preset. Once power is applied to the unit, the display shows a test of all display words and segments. While this message is displayed, the Toxgard II Monitor is functioning within factory-set calibration parameters. During normal operation, the Toxgard II Monitor displays the gas concentration of the surrounding environment. The corresponding output signal can be transmitted to a controller. For a complete listing of display and output conditions other than normal operation, see TABLE 5-1. NOTE: The combustible gas model of the Toxgard II Monitor is capable of detecting concentrations of certain combustible gases above 100 LEL. In the LOC LEL mode, the output signal is also locked at full-scale. NOTE: The Ultima Calibrator and Controller are compatible with both the Ultima Gas Monitor and the Toxgard II monitor. In the LOC mode, The Toxgard II Monitor will not revert to a normal condition until a successful zero operation has been performed. This is an exclusive safety feature of the Toxgard II Monitor which pre-empts the possibility of ambiguous readings when the sensor is exposed to concentration of gas above 100 LEL. In the 100 LEL mode, the combustible gas is over the 100 LEL range. It will return to normal operation when the gas concentration level falls below 100 LEL. Calibration As with any type of gas monitor, the only true check of its performance is to apply gas directly to the sensor. The frequency of the calibration gas tests depends on the operating time and chemical exposures of the sensors. New sensors should be calibrated more often until the calibration records prove sensor stability. The calibration frequency can then be reduced to the schedule set by the safety officer or plant manager. Before calibrating the sensors, it is good practice to apply power to the unit to allow the sensor to adapt to the new environment. Sensors should be powered at least one half hour before any calibration attempt is made.www.e-mogilev.com/uploads/files/cara-reset-manual-printer-epson-l200.pdf 2-3 Combustible sensors located in areas where non-combustible chemicals may leak, particularly ones known to reduce the sensitivity (see following list) should be calibrated after such exposures. Toxgard II Monitor Calibration Output Signal The Toxgard II Monitor is shipped with the calibration output signal disabled so the output signal will track the gas concentration value during the calibration process. In some applications, it may be desirable to disable or lock the output during calibration to a pre-determined output value to prevent activation of alarm devices. The calibration signal can be enabled using the Controller. When the calibration signal is enabled, the output signal is 3.75 milliamps during calibration. NOTE: The Controller is compatible with both the Ultima Gas Monitor and the Toxgard II Monitor. 2-7 Chapter 3, Calibration The Toxgard II Gas Monitor provides non-intrusive calibration through the use of the Calibrator or Controller. NOTE: The Calibrator and Controller are compatible with both the Ultima Gas Monitor and the Toxgard II monitor. When calibrating any Toxgard II Gas Monitor, refer to the Calibration Kit instructions. When first placing the Toxgard II Gas Monitor into operation it is good practice to perform a calibration. When replacing the sensor, it is necessary to do an initial calibration which allows the unit to store the initial sensor parameters for proper end-of-life indication. Also, identify and become familiar with all of the calibration components. During the calibration, it is necessary to quickly apply the span gas to the unit. Prior connection of the calibration components will aid in the ease of unit calibration. Equipment Required Three calibration kits (numbered 40, 41, and 54) are available from MSA for diffusion calibration of Toxgard II Gas Monitors. Kit 40 is also used to calibrate the Toxgard II Air Line Monitor. Calibration Kits 42 and 43 are used to calibrate Toxgard II monitors with pumped samples. All Calibration Kits are housed in a convenient carrying case and contain all items necessary (less gas) for a complete and accurate calibration. These caps can only be used when the ambient air does not contain the gas the monitor is detecting. NOTE: The calibration procedure for the sample draw Toxgard II Monitor is the same as the procedure for the diffusion version, except calibration gas is applied to the calibration entry port of the inlet flow block. Toxgard II Gas Monitor Calibration The only true check of any gas monitor’s performance is to apply gas directly to the sensor. The calibration procedure must be performed regularly. Calibration Documentation The Toxgard II Monitor records the date of the last successful calibration. This date can then be displayed on the front-panel LED (with the use of the Controller) or transmitted to a Control Data Center if the Ultima Plus Digital Network option was purchased. More frequent calibration may be required when the unit is new. Calibration frequency depends on operating time and chemical exposures of the instrument. Also perform calibration when installing or changing the power source of the control instrumentation. In some cases, it may be necessary to perform only a zero function of the Gas Monitor in lieu of a full zero and span procedure. Check with your safety officer or safety engineer to determine if only a zero function is necessary. The default value for the calibration gas on the ClO2 Toxgard II Gas Monitor is 1 ppm. To Zero the Toxgard II Gas Monitor Only NOTE: Combustible sensor configurations are only available with a remote sensor; side-mount and bottom mount sensors are not available in a combustible sensor configuration. NOTE: The zero or calibration process can be aborted at any time during the 30-second countdown interval; simply press any button on the Calibrator or Controller while aiming it at the unit or by pushing the internal push-button. The 30-second countdown interval is omitted for oxygen units. It is electronically zeroed. If the calibration is successful, the display will show END and 0 (FIGURE 3-10). It cannot make any corrections outside this range, such as when an empty or wrong cylinder of gas is applied or failure to begin gas flow within the allotted 30-second countdown occurs. 5. If Using Zero Gas: After a successful zeroing, remove the tubing from the Flow Controller and remove the Flow Controller from the cylinder; return all items to their appropriate location in the Calibration Kit. To extinguish the CAL FAULT flag, a complete calibration procedure must be performed. The Toxgard II Gas Monitor allows automatic zero adjustment only within a pre-defined range. They will not work properly if one regulator is used for multiple gases. Release the button when SPAN is showing. NOTE: The zero or calibration process can be aborted at any time during the 30-second countdown interval; simply press any button on the Calibrator or Controller while aiming it at the unit or press the internal push-button. It cannot make any corrections outside this range, such as when an empty or wrong cylinder of gas is applied or failure to begin gas flow within the allotted 30-second countdown occurs. The Toxgard II Gas Monitor allows automatic zero and span adjustments only within a pre-defined range. It cannot make any corrections outside this range, such as when an empty or wrong cylinder of gas is applied or failure to begin gas flow within the allotted 30-second countdown occurs. 15. After a successful calibration, remove the tubing from the Flow Controller and remove the Flow Controller from the cylinder; return all items to their appropriate location in the Calibration Kit. 16. For Calibration Kit 54 diffusion Hydrogen Chloride: a. After a successful calibration, flush the flow control regulator and tubing with 100 Nitrogen for five minutes. Use this flow control regulator with Hydrogen Chloride gas only. b. Store the flow control regulator and tubing in the desiccated sealed bag included in Calibration Kit 54 or equivalent dry container. NOTE: The zero or calibration process can be aborted at any time during the 30-second countdown interval; simply press any button on the Calibrator or Controller while aiming it at the unit or pushing the internal push-button. It cannot make any corrections outside this range, such as when an empty or wrong cylinder of gas is applied or failure to begin gas flow within the allotted 30-second countdown occurs. 16. After a successful calibration, remove the tubing from the Flow Controller and remove the Flow Controller from the cylinder; return all items to their appropriate location in the Calibration Kit. When the ZERO function is performed, the 30-second countdown is omitted because the Toxgard II unit performs the zero electronically. No calibration cap or zero gas is necessary. To meet the stated specification, it is necessary to span the Oxygen Toxgard II Gas Monitor with the Calibration Kit and an oxygen cylinder. The concentration of oxygen-in-air varies slightly due to changing relative humidity levels. These variations in oxygen levels are detected by the oxygen Toxgard II Gas Monitor. INITIAL Calibration When a new sensor element is placed in the sensor, an INITIAL Calibration must be performed. This procedure enables the unit to 3-25 gather data about the sensor to make accurate decisions for the CHANGE SENSOR function and the CAL FAULT function to work properly. If these words do not appear, abort the calibration; then, retry the above procedure. NOTE: This procedure must be initiated only when a new sensor element is installed. Figure 3-18. Typical DC Pump Version Installation Figure 3-19. Typical Air Aspirator Version Installation 3-27 Figure 3-20. However, the response to gas must be checked regularly to assure the instrument is functioning. NOTE: The only way to verify an instrument is functioning properly is to perform a calibration test. This test does not necessarily mean the unit must be adjusted, but that it must be checked with ZERO and SPAN gas, and observed for acceptable readings. The more frequent the calibration tests, the greater the chances for early detection of instrument failure resulting from instrument component failure, damage or power loss. Maintain a written log of instrument readings obtained during calibration. Increase the frequency of calibration tests when the sensor nears endof-service life, or when abnormally high variations with respect to the instrument log are observed. The only routine maintenance item is the sensing element itself, which has a limited lifetime. When the Toxgard II Monitor’s read-out indicates that the sensor must be changed, there is very little sensor lifetime remaining. It is good practice to obtain a replacement sensing element before the sensing element within your unit becomes inoperative. The Toxgard II Monitor is constantly performing a self-check. When the enclosure is open and connected to power, a source of ignition exists which could cause the explosion of combustible gas, resulting in damage, serious personal injury and death. Handle the sensor carefully; the electrochemical version is a sealed unit which contains a corrosive electrolyte. If electrolyte is leaking from the sensor, exercise CAUTION to ensure the electrolyte does not contact skin, eyes or clothing, thus avoiding burns. If contact occurs, rinse the area immediately with a large quantity of water. In case of contact with eyes, immediately flush eyes with plenty of water for at least 15 minutes. The leaking sensor should be disposed of in accordance with local, state and federal laws. For combustible versions, unscrew the gas-tight union (see FIGURE 1-6). Figure 5-1. Change Sensor Flag 5-2 Figure 5-2. Cap Location for Remote Combustible Gas Explosion-proof Sensor Figure 5-3. Cap Location for Toxic Gas or Oxygen General-purpose Model 5-3 Figure 5-4. Cap Location for Remote Toxic Gas or Oxygen Explosion-proof Sensor 3. Identify the sensor element needed and obtain the same type of sensor element. 4. Toxic or Oxygen Sensors: Unplug the sensor by pulling it straight down; properly dispose of sensor. Install the new sensor by aligning the pins; do not force onto pins. 5-4 Combustible Sensors: Connect the three-pin connector on the new sensor (FIGURE 5-5). This procedure differs slightly from a standard calibration procedure. Use of the INITIAL calibration procedure upon installation of a new sensor ensures the Toxgard II Monitor will perform a successful calibration. Failure to do so may result in a CAL FAULT reading (FIGURE 5-6). Figure 5-6. CAL FAULT Reading It is recommended that all other maintenance be performed at an MSA factory-authorized service center. See TABLE 5-1 for troubleshooting guidelines. 5-5 Table 5-1. Troubleshooting Guidelines SYMPTOM POSSIBLE CAUSE Unit will not power up properly Insufficient voltage or Check power supply and interconnecting wires current from power supply. Incorrect wiring connections. Wire strands touching at input terminal block CORRECTIVE ACTION Display shows CAL FAULT Cell signal too low or too Check calibration gas and flow system; high during calibration.A periodic check with a known concentration of calibration gas must be performed regularly to ensure proper sensor function. If UND persists, replace cell and perform Initial Calibration. NOTE: Although sensor output is not present during UND condition with no gas present, output will correctly respond to the presence of gas. When gas is no longer present, output will no longer be present. Failure to do so may seriously impair sensor performance.