Detcon 1000_CO2 - Manual (Page 16)

Model 1000 CO2
Model 1000 CO2 Instruction Manual Rev. 2.2 Page 12 of 28
5.2.1 Normal Operation
In normal operation, the display tracks the current status of the sensor and gas concentration and appears as:
“##.# % CO2”. The milliamp current output corresponds to the monitoring level and range of the sensor,
where Full Scale is 20mA.
5.2.2 Calibration Mode
Calibration mode allows for sensor zero and span adjustments. “1-ZERO 2-SPAN”
Zero Adjustment
Zero is set in ambient air with no CO
2
gas present or with zero gas applied to the sensor. “AUTO ZERO”
Span Adjustment
Unless otherwise specified, span adjustment is performed at 50% of full-scale range of CO
2
. “AUTO SPAN”
5.2.3 Program Mode
Program Mode provides a program status menu (View Program Status) to check operational parameters.
Program Mode also allows for the adjustment of alarm set point levels, the calibration gas level setting, the
heater voltage level, range, and linearity correction. The programming menu also allows the calibration gas
level setting and Alarm levels (see Programming Sensors, Section 7.0).
Program Status
View Program Status is a listing that allows the operator to view the gas, range, and software version number
of the program, as well as the current alarm settings, calibration gas level setting, offset value, RS-485 ID
number, and estimated remaining sensor life.
The following procedure is used to view the programming status of the sensor:
a) Enter the programming menu by holding the programming magnet stationary over “PGM 2” for 15
seconds. When the display changes to “VIEW PROG STATUS”, withdraw the magnet. Scroll through
the programming menu by momentarily waving the programming magnet over either “PGM 1” or “PGM
2”. The menu options are: View Program Status, Set Alarm 1 Level, Set Alarm 2 Level, and set Cal
Level.
b) Scroll to the “VIEW PROG STATUS” listing and hold the programming magnet over “PGM 1” for 3
seconds. The display will automatically scroll, at five-second intervals, through the following information
before returning back to the “VIEW PROG STATUS” listing.
¾ Gas type, range of detection and software version number. The menu item appears as: “02044-200056.31”
¾ Alarm set point level of alarm 1. The menu item appears as: “ALM1 SET @ ##%”
¾ Alarm firing direction of alarm 1. The menu item appears as: “ALM1 ASCENDING” or descending.
¾ Alarm relay latch mode of alarm 1. The menu item appears as: “ALM1 NONLATCHING” or latching.
¾ Alarm relay energize state of alarm 1. The menu item appears as: “ALM1 DE-ENERGIZED” or
energized.
¾ Alarm set point level of alarm 2. The menu item appears as: “ALM2 SET @ ##%”
¾ Alarm firing direction of alarm 2. The menu item appears as: “ALM2 ASCENDING” or descending.
¾ Alarm relay latch mode of alarm 2. The menu item appears as: “ALM2 LATCHING” or non-latching.
¾ Alarm relay energize state of alarm 2. The menu item appears as: “ALM2 DE-ENERGIZED” or
energized.
¾ Alarm relay latch mode of the fault alarm. The menu item appears as: “FLT NONLATCHING” or
latching.