SST GT814 Design Manual
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SST GT814 Design Manual

Nova-sensor elite toxic gas detector
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Design Manual
Installation • Operation • Maintenance
Model GT814
NOVA-Sensor ELITE
Toxic Gas Detector
70117
23282 Mill Creek Drive, Suite 215
Laguna Hills, CA 92653 USA
+1.949.583.1857 Phone
+1.949.340.3343 Fax
www.safetysys.com
support@safetysys.com
The information and technical data disclosed by this document may be used and disseminated only for the
purposes and to the extent specifically authorized by Safety Systems Technology in writing. Such information and
technical data are proprietary to Safety Systems Technology and may not be used or disseminated except as
provided in the foregoing sentence.

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Summary of Contents for SST GT814

  • Page 1 Design Manual Installation • Operation • Maintenance Model GT814 NOVA-Sensor ELITE Toxic Gas Detector 70117 23282 Mill Creek Drive, Suite 215 Laguna Hills, CA 92653 USA +1.949.583.1857 Phone +1.949.340.3343 Fax www.safetysys.com support@safetysys.com The information and technical data disclosed by this document may be used and disseminated only for the purposes and to the extent specifically authorized by Safety Systems Technology in writing.
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  • Page 3: Table Of Contents

    Quick Finder MODEL GT814 NOVA‑Sensor ELITE™ Toxic Gas Detector DESCRIPTION ....................814-1 TECHNICAL SPECIFICATIONS ................ 814-2 SELECTING A LOCATION FOR THE GAS DETECTOR ........814-3 “ONE HOUR” INSTALLATION INSTRUCTIONS ..........814-4 1. MOUNT THE DETECTOR ELECTRONICS ENCLOSURE ........814-4 2. OPEN DETECTOR HOUSING AND REMOVE ELECTRONICS MODULE ....814-4 3.
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  • Page 5: Model Gt814 Nova-Sensor Elite

    Model GT814 Toxic Gas Detector loss of power or internal failure of the unit. Operating personnel use the Magnetic Key Fob to control the GT814 Detector. When the Key Fob is held near the ▲MagPoint▲ on the top of the enclosure, the automatic calibration sequence is initiated.

  • Page 6: Technical Specifications

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector TECHNICAL SPECIFICATIONS Power Input ......24 volts DC nominal, 80 mA standby, 140 mA alarm. Operates within specifications from 16 to 32 volts. Full scale measuring range ... 10, 20, 50, 100, 200 or 500 PPM (parts per million) 100, 200, 500, 1000, 2000 or 5000 PPM (high concentration) Operating Temperature ..

  • Page 7: Selecting A Location For The Gas Detector

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector SELECTING A LOCATION FOR THE GAS DETECTOR To insure the fastest possible detection of leaking gases, the location of the sensor is important. Lighter than air gases tend to accumulate at the highest point in an enclosed space, whereas heavier than air gases will accumulate at the lowest point in the room.

  • Page 8: One Hour" Installation Instructions

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector “ONE HOUR” INSTALLATION INSTRUCTIONS The Model GT812 Toxic Gas Detector is shipped fully as- sembled and pre-calibrated to the full scale range of toxic gas that you have specified with your order. It can be installed and be fully operational in less than one hour.

  • Page 9: Connect Remote Sensor Head (Optional) To The Detector

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector 4. Connect Remote Sensor Head (optional) to the Detector Two conductors are required between the sensor and the electronics. These wires will carry a maximum of current of 20 mA at 32 volts DC, so large wires are not required.

  • Page 10: Connect Optional Remote Reset Switch

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector 6. Connect optional Remote RESET Switch The integral ▲MagPoint▲ on the NOVA-Sensor ELITE housing can be used to clear any relays or alarms in the NOVA-Sensor ELITE which have been latched when activated. Acti- vating the ▲MagPoint▲...

  • Page 11: Set Low Alarm Relay Contact For Latching Operation

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector 9. Set Low Alarm Relay Contact for Latching Operation User Option Switch number 4 sets the operation of the LOW alarm LED and relay. Switch 4 DOWN sets Low Alarm NON-LATCHING. The low alarm will automatically reset whenever the gas level falls below the set point.

  • Page 12: Routine Operation Of The Nova-Sensor Elite

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector ROUTINE OPERATION OF THE NOVA‑Sensor ELITE The NOVA-Sensor ELITE is designed to provide protection of personnel and property from gas leaks 24 hours a day, 7 days a week with no regular intervention required.

  • Page 13: High Gas Alarm Mode

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector High Gas Alarm Mode If the gas concentration continues to increase above the low alarm setpoint, the following occur: The present gas concentration is displayed (The SCREEN FLASHES and the LOW  ALARM indicator will remain flashing during this time due to the low gas alarm) The 4-20 mA signal to external equipment increases to report the present gas con- ...

  • Page 14: Maintenance

    Under normal operating conditions, SST gas detectors should be recalibrated every 90 days. However, the change in calibration over time is a function of how much “background”...

  • Page 15: Recalibration Instructions

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector Recalibration Instructions Calibration will take care of changes in sensor performance and drift. The automatic calibra- tion procedure provides the NOVA-Sensor ELITE with reference points needed to accurately measure gas levels. During the calibration procedure, clean air as well as calibrated test gas are applied to the detector.

  • Page 16: Replacing The Electrochemical Fuel Cell Sensor Element

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector Failed or Incomplete Calibrations: The NOVA-Sensor ELITE will wait for up to 5 minutes for gas to be applied during the calibra- tion procedure. If no gas is detected within the 5 minutes, the calibration will be aborted and the message CALIBRATION FAILURE, USING PRIOR CALIBRATION DATA is displayed.

  • Page 17: Calibrating To A Different Target Gas

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector Calibrating to a different Target Gas Your NOVA-Sensor ELITE includes internal parts that are specific to the target gas that it displays. It is not possible to use this detector to monitor for any other toxic gas unless the detector is returned to the factory for rebuilding.

  • Page 18: Troubleshooting

    Although not a regular occurrence, it is possible that an internal failure has occurred in the detector electronics module. We suggest you purchase a replacement electronics module, then return the failed electronics module to SST for repairs. The repaired module can then be placed in your stock for future use.

  • Page 19: Other Calibration Messages

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector Other Calibration messages The below listed messages occur during recalibrations. To stop the calibration process at any one of these steps, just activate the ▲MagPoint▲ on the top side of the enclosure two times.

  • Page 20: Replacement Parts

    MODEL GT814 NOVA-Sensor ELITE™ Toxic Gas Detector REPLACEMENT PARTS To purchase these parts, contact your local SST distributor, or contact us at sales@safetysys.com. Order No. Plug-in Electro-chemical Fuel Cells 20348-1 Hydrogen Sulfide 20 to 500 PPM (Orange case) 20348-11 Hydrogen Sulfide 1000 to 5000 PPM (High Concentration)

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