GasSens Economy Gas Detection System
from Analytical Technology

Receiver modules provide the electronic brains for the detection and alarm system. Each compact module includes a digital display of gas concentration, isolated analog output, and 4 relay outputs. Receivers may be located up to 1,000 feet from sensor/transmitters for remote indication or can provide local control functions such as valve shut off while transmitting a 4-20 mA signal to remote displays or data loggers. Receiver modules provide an interface between the detection system and external alarming and data logging requirements. One module is used with each sensor/transmitter.

• LED Display - Indicates gas concentration directly in ppm, ppb or %. The display may be operated in high intensity mode for outdoor use or in normal mode for indoor application
• Analog Output - An isolated 4-20 mA output is standard. The output will drive loads up to 1,000 ohms for use in recording, data logging or computer input.
• Two Alarm Setpoints - Alarm setpoints are factory adjusted to standard values but may be set to any value from 5% to 100% of range. Front panel LED's marked Warning and Alarm indicate the status of each alarm setpoint. A standard alarm time delay of 2 seconds or a longer delay of 10 seconds may be selected. In addition, alarms may be switch programmed to activate either above or below the setpoint.
• Three Alarm Relays - Output relays are SPDT with unpowered contacts for use in activating external signaling devices, control elements or for input to telemetry or annunciator systems. Each relay may be assigned to either alarm setpoint for application flexibility. Relays are factory set to energize on alarm, but may be switch programmed for fail safe operation. Relays may be also set either latching or non-latching operation.
• Trouble Alarm & Relay - Should the sensor/transmitter input be lost, a trouble light (LED) on the front panel will flash and an associated relay will activate. For those systems equipped with the Sensor Auto-Test feature, this alarm will also activate if the sensor does not respond to the automated gas test.
• Front Panel Reset Switch - A single front panel switch marked A/R serves a number of functions. When an alarm occurs, the switch will silence an audible horn wired to the module and will change the alarm lights from flash to steady on. After the alarm condition has cleared, the switch will also activate an electronic module test, inhibit alarm contacts and activate the sensor Auto-Test.
• Remote Reset Input - Terminals are provided for connection of a remote reset switch so that alarms can be acknowledged form a remote location or through a telemetry system.
• Pluggable Terminal Blocks - External electrical connections are made to plug in terminal blocks. Should module service ever be needed, modules can be replaced in minutes.

Basic Sensor/Transmitter

Sensor/Transmitter With Auto-Test

Explosion Proof Sensor/Transmitter

GasSens gas detection systems employ electrochemical sensors developed and manufactured by ATI. Expertise in electrochemistry and sensor design provide the foundation for leak detection systems that perform continuously with minimal maintenance. Sensors are rated for ambient temperature from -25 to 50ÀC, allowing both indoor and outdoor applications. Excellent zero stability and high sensitivity and selectivity combine to make ATI sensors the best available.

Gas sensors are closely coupled to a digital transmitter for excellent noise immunity and the ability to transmit long distances using unshielded cable. The transmitter is powered from the receiver module and uses a unique current pulse position technique to send information to the receiver over a two wire connection. The receiver connection in not polarity sensitive, virtually eliminating the possibility of incorrect transmitter wiring. Sensor/transmitters can be located up to 1,000 feet from receiver modules.

A compact universal power supply in a DIN rail module similar to the receiver was developed. The power supply will accept any AC or DC input from 85 to 225 volts, without adjustment.

Other options include a battery back up system and horn and strobe light options.

Specifications

Concentration Display	4 Digit LED, sunlight readable
Input	Digital signal, 2 wire connection to remote sensor/transmitter
Output	Isolated 4-20 mA or 0-20 mA DC, 1,000 ohms maximum load
Alarms	Two adjustable concentration alarms, setpoints adjustable form 5-100% of range
Alarm Indicators	High intensity LED bars for Warning (low setpoint) and Alarm (high setpoint)
Indicator Function	Warning indicator non-latching, alarm latching
Alarm Relays	Three assignable alarm relays, 10 A, 120 VAC (5A, 250 VAC) resistive alarm relays assignable to either alarm setpoint
Relay Function	Configurable for normal/fail-safe, latching/non-latching and fast/slow operation
Relay & Indicator Reset	Activated from front panel switch or through remote reset
Trouble Alarm	Front panel LED indicator and SPDT, 10 A 120 VAC (5A, 250 VAC) resistive relay; Relay factory set to fail-safe operation
Trouble Function	Indicates loss of sensor/transmitter input or failure of sensor Auto-Test (if in use)
Gas Indicator	LED bar on front panel with gas symbol overlay
Mounting	Module mounts to 35 x 7.5 mm DIN rail
Electrical Connection	Quick disconnect plug-in terminal blocks
Module Enclosure	Noryl
Power	9-15 VDC, 30 mA maximum

Gases Available

Measurement	Gas type and range customer specified
Transmitter Type	Two wire system, current pulse operation signal
Sensor	Electrochemical gas diffusion type
Accuracy	Generally +/-5% of value, but limited by available calibration of gas accuracy
Zero Drift	Sensor dependent but normally less than 2% per month, non-cumulative
Enclosure	NEMA 4X polystyrene
Optional Enclosure	Explosion proof cast aluminum, Class I, Div 1, Gps B, C & D
Electrical Connection	Quick disconnect terminal blocks (two wires without polarity)
Connection Distance	Up to 1,000 feet to receiver
Option	Sensor Auto-Test
Power	12 VDC from receiver module