GASMAX/TX Operation & Maintenance Manual, Revision 1.0
Page 11
4
OPERATION
The GASMAX/TX wireless gas monitor is designed to detect dangerous levels of toxic or hydrocarbon
combustible gases and transmit that information to a GDS Corp remote site manager or controller /
receiver.
The GASMAX/TX uses the new highly integrated 10-97xx series ultra-low-power infrared or zero power
electrochemical Smart Sensors that allow each sensor to be individually optimized for the target gas,
range and environmental conditions.
Figure 4-1: GASMAX/TX Block Diagram
Toxic gases entering the sensor head react with the electrolyte in the sensor to produce a small electrical
output
signal. Electronics on the sensor board amplify the signal (“PGA Gain”) and covert the information from
analog to digital using a 12-bit A/D converter. If an ultra-low-power infrared sensor is being used,
hydrocarbon gases enter the sensor and block the passage of infrared light from the IR source to the
detector. An integrated microprocessor in the infrared sensor linearizes the value and converts the output
to digital.
IMPORTANT:
TOXIC SENSORS ARE SUBJECT TO ACCELERATED DETERIORATION IF POWER IS NOT APPLIED
WITHIN 3 MONTHS OF SHIPMENT FROM GDS CORP.
12
ZZzzz
“PGA Gain”
Adjustment
Sensor
Element
Sensor Digital Output:
800 counts = 0%
4000 counts = 100%
High Resolution
LCD Display
Sensor
Amplifier
A/D
User Interface & System Control
Process
Alarms
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3.6V Battery
900 MHz or
2.4 GHz Radio
Central
Processor
Toxic or Combustible
Gas
Data
Transmission
to WSM
