Instructions 95-8532 U9500 Infiniti® Transmitter and Metal Oxide Semiconductor (MOS) H2S Gas Sensor 1.
Table of Contents APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 IMPORTANT SAFETY NOTES . . . . . . . . . . . . . . . . . . . . . . . . . 3 DESCRIPTION . .
INSTRUCTIONS U9500B210X Infiniti ® Transmitter and Metal Oxide Semiconductor (MOS) H2S Gas Sensor APPLICATION The model U9500B Infiniti® Transmitter is designed for use with Det-Tronics Metal Oxide Semiconductor (MOS) sensors for detection of hydrogen sulfide gases and vapors. Gas concentrations are displayed in ppm on an alphanumeric display. The transmitter provides a user selectable isolated/non-isolated 4 to 20 milliampere output signal that corresponds to the detected gas concentration.
Temperature Range— Operating: 32°F to +167°F (0°C to +75°C). Storage: –67°F to +257°F (–55°C to +125°C). DETECTION RANGE— 0 to 100 ppm RELAY CONTACTS (Optional)— Three Alarm relays: Form C, 5 amperes at 30 vdc. Selectable normally energized or de-energized as a group; low and auxiliary alarm selectable together for latching or non-latching contacts, high alarm contacts are always latching. One Fault relay: Form C, 5 amperes at 30 vdc.
1.5 (3.8) To minimize the risk of damage, handle the transmitter module by the edges only. Do not touch the circuit board, or electronic components. 2.0 (5.2) The fault detection circuitry does not monitor the operation of external response equipment or the external wiring to these devices. It is important that these devices be checked periodically to ensure that they are operational. 1.7 (4.
Two additional options are available for resetting the transmitter. A user supplied switch can be wired to the transmitter terminal block and used to reset the device from a remote location. In addition, Detector Electronics offers a special optional enclosure with a pushbutton pre-installed within a multi-port electrical enclosure for customers who do not prefer magnetic switches.
CAUTION Wires can become pinched between the cover and base if they are not properly tucked down inside the enclosure. BRING FIELD WIRING TO TOP GND FIELD WIRING ENTERS FROM RIGHT SIDE 7. Fasten the transmitter module to the mounting bracket with the two captive screws located inside the notch on either side of the top of the transmitter. Remove the wire clip and set it aside. SENSOR PLUGS INTO MODULE HERE. PLUG IS KEYED TO PREVENT IMPROPER INSTALLATION. 8.
– NOT USED PW RESET IN CAL NOT USED OUT EXTERNAL RESET + ** POWER + 24 VDC + – 4 TO 20 MILLIAMPERE OUTPUT SIGNAL POWER COMMON + POWER + 24 VDC + 4 TO 20 MILLIAMPERE OUTPUT SIGNAL ** – – POWER POWER COMMON POWER S *SPARE S *SPARE HIGH RELAY NC COM NO LOW RELAY NC COM NO FAULT RELAY NORMALLY CLOSED CONTACT AUX RELAY NC COM NO FAULT RELAY COMMON CONTACT FLT RELAY NO COM NC FAULT RELAY NORMALLY OPEN CONTACT HIGH ALARM RELAY NORMALLY OPEN CONTACT HIGH ALARM RELAY COMMON CONTACT HI
– POWER – PW RESET IN CAL + + + – POWER +24 VDC NOT USED – NOT USED OUT + – + 4 TO 20 MA SEE NOTE 1 LOW ALARM RELAY CONTACTS SEE NOTES 2, 4, 5 AUXILIARY ALARM RELAY CONTACTS SEE NOTES 2, 4, 5 NOTE 1 THE SENSOR CONNECTS TO A PLUG ON THE OPPOSITE SIDE OF THE TRANSMITTER FROM THE ELECTRICAL TERMINALS. NOTE 2 ALL RELAY CONTACT DESIGNATIONS INDICATE RELAY STATE WITH NO POWER APPLIED — RELAYS DE-ENERGIZED.
R8471 CONTROLLER – 1 + 2 CHASSIS GROUND 4-20 MA – 5 + 6 SIGNAL – 7 HIGH ALARM / OC 10 AUX. ALARM 11 AUX.
DISPLAY AND CONTROLS, OPTIONS, DEFAULTS PROGRAMMING OPTIONS DISPLAY AND CONTROLS The operating range limits and the corresponding default setpoints and calibration gases are as follows: Operating Range The Infiniti uses an eight character display for identifying system status conditions and sensor input, a magnetic reed switch for resetting the unit and entering different operating modes, and pushbuttons for programming and calibrating the system.
Table 1—Display And Controls Display/Indicator Description PPM This display is always on and functions as a power indicator. The display provides a continuous reading of the sensor input in both the Normal and Calibrate modes. In the event of a fault, it identifies the nature of the fault with a fault message. In other operating modes it shows the alarm setpoints and programmed calibration gas concentration.
Setpoints External Calibration The Infiniti Transmitter has three independent alarm outputs (low, high and auxiliary), with field selectable setpoints. For both relay and non-relay models, these setpoints correspond to the HI, AUX, and LO ALARM indicators on the display. Calibration procedures are normally initiated and executed using the Cal Magnet to activate the CAL/ RESET switch.
Table 3—Infiniti Outputs Output Description 4 to 20 Milliamperes (Standard) • The linear 4 to 20 ma output: – corresponds to the field-programmed gas range. – can be calibrated in the field for maximum accuracy. – is user selectable for isolated or non-isolated use. Refer to the “Setup ” section for programming information. Relay (Optional) • Option includes a set of four relays: – High Alarm – Low Alarm – Auxiliary Alarm – Fault • Includes 4 to 20 ma output.
Table 4—Infiniti Modes of Operation Operating Mode Description Warmup • When power is applied to the transmitter, it enters a Warmup mode to allow the sensor output to stabilize before beginning normal operation. During this time the: – Fault relay is de-energized. – Alarm relays go to non-alarm state (either energized or non-energized, as programmed) – Display alternates between “WARM-UP” and “MOS H2S.” – Current output indicates a fault condition (less than 1.0 ma).
Table 4—Infiniti Modes of Operation (Continued) Operating Mode Description Reset The Reset mode is entered by holding the Cal magnet to the side of the transmitter enclosure next to CAL/ RESET on the display face of the unit. • Standard – When the Cal magnet is held there for less than one second, the alarm indicators turn off and all relay outputs return to their normal condition if no alarms or faults are occurring.
INSTALLATION CHECKLIST STARTUP PROCEDURE The following checklist is provided as a means of checking the system to be sure that all phases of system installation are complete and have been performed correctly. 1. Remove power from all output devices to prevent actuation. 2. Apply power to the system. If the proper “type of sensor” indication does not appear in the display during warmup, consult the factory. 1. Enclosure is securely mounted and sensor is pointing down. 3.
SETUP PROCEDURE CAUTION While in the Setup Mode, the current loop output will drop to less than 1 ma. For models without relays, this is the only remote indication that the unit is not in the Normal operating mode. For models with relays, the fault relay indicates a fault. In either case, the transmitter will remain in the Setup mode until Setup is complete. The transmitter must be manually stepped through the sequence below in order to return to the Normal operating mode. 1.
Table 6—Infiniti Setup (Continued) Display Function Description/Action “YES EXT” “YES CAL” or “NO EXT” “NO CAL” Option to allow external reset button to be used for calibration in addition to or instead of Cal Magnet. When “Yes” is selected, the external reset input functions exactly like the Cal Magnet. • Press INCREASE or DECREASE to change the setting. “4-20 CAL” “NO” Option to select a Current Loop Output other than factory calibrated 4 to 20 ma.
CALIBRATION AUTO CALIBRATION PROCEDURE The Infiniti with MOS H2S sensor is calibrated using the Automatic Calibration sequence. All adjustments are made automatically by the transmitter once calibration has been initiated. Refer to Table 7 for the Automatic Calibration Procedure. Frequency of Calibration The MOS H2S sensor is typically utilized to protect human life. For this reason, a frequent calibration inspection is recommended.
Table 7—Automatic Calibration Procedure Description Display Operator Action Normal operation/no gas present Indicates the detected gas concentration Initiate calibration Sequences through the Setup settings Enters the Calibration mode Display shows detected gas concentration and alternating message: “ZERO” “CAL” • If the possibility of background gases exists, purge the sensor with clean air to ensure accurate calibration. • Hold the Cal magnet to the CAL/RESET magnetic switch for 7 seconds.
maintenance NOTE If the detector cannot be calibrated or responds slowly to the calibration gas, check the condition of the filter before replacing the sensor. A routine maintenance schedule is recommended to ensure that the detector is in peak operating condition at all times. To ensure top performance, service the device as follows. SENSOR REPLACEMENT The MOS sensor is not field repairable. If calibration can no longer be properly performed, the sensor must be replaced.
TROUBLESHOOTING Clearing Faults Generally, faults that occur while in the normal mode are self-clearing once the fault condition has been corrected. Faults that occur while in the warmup and calibration modes require a manual reset to clear (using either an externally connected reset switch or the Cal magnet). After the fault condition has been corrected, the fault relay automatically switches to the normal (energized) state, the DC current output returns to normal, and the fault message turns off.
Table 8—Fault Messages, Explanations And Corrective Action Fault Message Display Blank Display EEPROM sumcheck failure. Cycle power to clear fault. If fault persists, return the unit to the factory for repair. “COMPUTER” “FAILURE” RAM or processor failure. Cycle power to clear fault. If fault persists, return the unit to the factory for repair. “WDT” “FAILURE” Watchdog timer failure. Cycle power to clear fault. If fault persists, return the unit to the factory for repair.
Detector Electronics Corporation 6901 West 110th Street Minneapolis, MN 55438 USA X3301 Multispectrum IR Flame Detector PointWatch Eclipse® IR Combustible Gas Detector Eagle Quantum Premier® Safety System Eagle Logic Solver Safety System T: 952.941.5665 or 800.765.3473 F: 952.829.8750 W: http://www.det-tronics.com E: det-tronics@det-tronics.
