Detcon 1000_CO2 - Manual (Page 22)

Model 1000 CO2
Model 1000 CO2 Instruction Manual Rev. 2.2 Page 18 of 28
7.4 Calibration Gas Level
If the calibration gas level setting does not equal the calibration span gas concentration, or the calibration gas
level needs to be changed, adjust the calibration gas level setting so that it is equal to the calibration span gas
concentration.
a) Enter the programming menu by holding the programming magnet stationary over “PGM 2” for 30
seconds until the display reads “VIEW PROG STATUS”, and then withdraw the magnet. Scroll through
the programming menu by momentarily waving the programming magnet over “PGM 1” or “PGM 2”.
b) From the programming menu scroll to the calibration level listing. The menu item appears as: “SET CAL
LEVEL”. Enter the menu by holding the programming magnet stationary over “PGM 1” for 3 seconds
until the display reads “CAL LEVEL @ ##%”, then withdraw the magnet. Use the programming magnet
to increase (PGM 1) or decrease (PGM 2) the display reading until the reading is equal to the desired
calibration span gas concentration.
c) Exit to the programming menu by holding the programming magnet over “PGM1” for 3 seconds.
d) Exit back to normal operation by holding the programming magnet over “PGM 2” for 3 seconds, or, the
sensor will automatically return to normal operation in 30 seconds.
8.0 Display Contrast Adjustment
Detcon MicroSafe™ sensors feature a 16-character backlit liquid crystal display. Like most LCD’s, character
contrast can be affected by viewing angle and temperature. Temperature compensation circuitry included in
the MicroSafe™ design will compensate for this characteristic; however temperature extremes may still cause
a shift in the contrast. Display contrast can be adjusted by the user if necessary. However, changing the
contrast requires that the sensor housing be opened, thus, declassification of the area is required.
To adjust the display contrast, remove the enclosure cover, and use a jeweler’s screwdriver to turn the contrast
adjust screw located beneath the metallic faceplate. The adjustment location is marked “CONTRAST”.
9.0 Programming Features
Model IR-640/IR-642 MicroSafe™ Sensors incorporate a comprehensive program to accommodate easy
operator inter face and fail-safe operation. Program features are detailed in this section. Each sensor is factory
tested, programmed, and calibrated prior to shipment.
Over Range
When the sensor detects gas greater than 100% of the full-scale range, it will cause the display to flash
“OVER-RANGE” on and off.
Optics Life
The Optics Life feature is a reference based on the signal output from the optical sensor. When an optical
sensor life of 25% or less remains; the optical sensor should be replaced within a reasonable maintenance
schedule.
Calibration Fault
If during calibration the sensor circuitry is unable to attain the proper adjustment for zero or span, the sensor
will enter into the calibration fault mode and cause the display to alternate between the sensor’s current status
reading and the calibration fault screen which appears as: “CAL FAULT.2”.