Detcon IR-642 - Manual (Page 16)

Span calibration is complete.
3.7.3 Additional Notes
1. Upon entering the calibration menu, the 4-20 mA signal drops to 2 mA and is held at this level until you
return to normal operation.
2. 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 which will activate fault alarm functions (see section 3.10) and cause the dis-
play to alternate between the sensor’s current status reading and the calibration fault screen which appears as:
“CAL FAULT”. If this occurs you may attempt to recalibrate by entering the calibration menu as described in
section 3.8.1-a. If the sensor fails again, defer to technical trouble shooting.
3.7.4 Calibration Frequency
In most applications, quarterly zero calibration and annual span calibration intervals will assure reliable detection.
However, industrial environments differ. Upon initial installation and commissioning, close frequency tests should
be performed monthly. Test results should be recorded and reviewed to determine a suitable calibration interval.
3.8 S
TATUS OF
P
ROGRAMMING
, A
LARMS
, C
ALIBRATION
L
EVEL
, RS-485 ID,
AND
S
ENSOR
L
IFE
The programming menu has a programming status listing that allows the operator to view the gas, range, and soft-
ware version number of the program, as well as the current alarm settings, calibration gas level setting, RS-485 ID
number, sensor temperature, and estimated remaining sensor life. The programming menu also allows the calibra-
tion gas level setting (see section 3.72), and alarm levels (see section 3.9).
The following procedure is used to view the programming status of the sensor:
a) First, enter the programming menu by holding the programming magnet stationary over “PGM 2” for 30 sec-
onds until the display reads “VIEW PROG STATUS”, then withdraw the magnet. At this point you can
scroll through the programming menu by momentarily waving the programming magnet over “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) Next, scroll to the “VIEW PROG STATUS” listing and then hold the programming magnet over “PGM 1”
for 3 seconds. The menu will then automatically scroll, at f ive second intervals, through the following informa-
tion before returning back to the “VIEW PROG STATUS” listing.
1 - The gas type, range of detection and software version number. The menu item appears as: “CO2 RANGE V6.0”
2 - The alarm set point level of alarm 1. The menu item appears as: “ALM1 SET @ x.xx%”
3 - The alarm f iring direction of alarm 1. The menu item appears as: “ALM1 ASCENDING”
4 - The alarm relay latch mode of alarm 1. The menu item appears as: “ALM1 NONLATCHING”
5 - The alarm relay energize state of alarm 1. The menu item appears as: “ALM1 DE-ENERGIZED”
6 - The alarm set point level of alarm 2. The menu item appears as: “ALM2 SET @ x.xx%”
7 - The alarm f iring direction of alarm 2. The menu item appears as: “ALM2 ASCENDING”
8 - The alarm relay latch mode of alarm 2. The menu item appears as: “ALM2 LATCHING”
9 - The alarm relay energize state of alarm 2. The menu item appears as: “ALM2 DE-ENERGIZED”
10 - The alarm relay latch mode of the fault alarm. The menu item appears as: “FLT NONLATCHING”
11 - The alarm relay energize state of the fault alarm. The menu item appears as: “FLT ENERGIZED”
12 - The calibration gas level setting. The menu item appears as: “CalLevel @ xx%”
13 - Identif ication of the RS-485 ID number setting. The menu item appears as: “485 ID SET @ 1”
14 - Sensor temperature in °C appears as: “TEMPERATURE xx °C”
15 - The estimated remaining sensor life. The menu item appears as: “OPTICS AT 100%”
c) Exit back to normal operations by holding the programming magnet over “PGM 2” for 3 seconds, or automati-
cally return to normal operation in 30 seconds.
3.9 P ROGRAMMING A LARMS
Detcon Model IR-640/IR-642 Carbon Dioxide Sensor PG.16