10 p – Detcon FP-524C User Manual
Page 17
3.9 S
TATUS OF
P
ROGRAMMING
, T
ARGET
G
AS
, C
ALIBRATION
G
AS
, C
ALIBRATION
L
EVEL
, S
ENSOR
L
IFE
,
AND
B
RIDGE
V
OLTAGE
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 target and calibration gas settings, calibration gas level setting,
bridge voltage, and estimated remaining sensor life. The programming menu also allows the changing of target gas
and calibration gas settings (see section 3.7), the calibration gas level setting (see section 3.8.2), and bridge voltage
setting (see section 3.6.2).
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 seconds
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 Gas Factor, Set Cal Factor, Set Cal Level, and Set Bridge Voltage.
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:
“LEL 0-100 V6.0”
2 - The target gas K factor. The menu item appears as:
“GAS FACTOR #.##”
3 - The calibration gas K factor. The menu item appears as:
“CAL FACTOR #.##”
4 - The calibration gas level setting. The menu item appears as:
“CalLevel @ xx%”
5 - Sensor bridge voltage. The menu item appears as:
“BRIDGE @ #.## VDC”
6 - The estimated remaining sensor life. The menu item appears as:
“SENSOR LIFE 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.
3.10 P
ROGRAM
F
EATURES
Model FP-524C 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% LEL, it will cause the display to f lash
“100 % LEL”
on and off.
Under-Range Fault
If the sensor zero base line should drift to below a –10% LEL, the display will indicate a fault:
“SIGNAL FAULT”
.
Open Sensor Bridge Fault
If either the active or reference side of the catalytic sensor bead should fail and become electrically open, the dis-
play will indicate a fault:
“SENSOR FAULT”.
Sensor Heater Voltage Functions/Fault
The heater voltage is continuously monitored. Normal heater voltage is 2.7 VDC. If the voltage has drifted from
the programmed heater voltage value by more than ±.1V, the display will indicate a fault:
“HEATER FAULT”.
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”.
The Fault LED will light and the 4-20 mA signal is
dropped to 0 mA until the Fault is corrected.
Model FP-524C Combustible Gas Sensor PG.17