Critical Environment Technologies AST-IS5 Installation Manual
Critical Environment Technologies
Canada Inc.
www.critical-environment.com
Installation Manual for
AST
AST--
IS5
IS5
Analog transmitters with Infrared CO2
& Temperature sensors with LCD display & relay
#145, 7391 VANTAGE WAY
DELTA, BC CANADA V4G 1M3
PH: 604-940-8741 TOLL FREE: 877-940-8741
MANUAL REVISION-C, AUGUST 18, 2010
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AST-IS5
ANALOG TRANSMITTER
with
INFRARED CO2 SENSOR & TEMPERATURE SENSOR
and
LCD DIGITAL DISPLAY
This AST-IS series are reliable, long lif e analog transmitters. Life expectan cy of the
infrared sensor is 15-years. The AST-IS5 is an advanced transmitter that has been
designed for use in the “climate zone”.
It provides an output for CO2 gas and an output for temperature. The local LCD
display provides real time values for the user. Standard measurement range is
0-2000 ppm.
SELF-DIAGNOSTICS
The system contains complete self diagnostic procedures. A full system test is
executed automatically every time the power is turned on. In addition, constantly
during operation, the sensors are checked against failure by checking the valid
dynamic measurement ranges. All EEPROM updates, initiated by the sensor itself
are checked by subsequent memory read back and data comparisons. These
different system checks return error bytes to the system RAM.
NOTE: The sensor accuracy is defined as continuous oper ation (at least 3-weeks
after installation).
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FUNCTIONAL DESCRIPTION
OUT-1 = Measuring signal of CO2 concentration lowest value - highest value.
OUT-2 = Measuring signal of temperature lowest value - highest value.
OUT-3 = ON / OFF signal of demand of air quality
The opening of the relay is controlled by the hysteresis of th e relay.
CO2 concentration
OUT-2 100%
Measuring
Signal
0%
lowest value highest value
* The measuring signal of CO2
Measured temperature
OUT-2 100%
Measuring
Signal
0%
lowest value highest value
* The measuring signal of temperature
Relay (ON / OFF)
Relay
Closed
Open
* The relay output
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