Detcon FP-624C - Manual (Page 7)

c) Alarm 2 Level
d) Target gas selection (gas K factor)
e) Calibration gas selection (cal K factor)
f) Calibration Level
g) Set Bridge Volts
3.4.1 Normal Operation
In normal operation, the display tracks the current status of the sensor and gas concentration and appears as:
“0 % LEL”. The mA current output corresponds to the monitoring level and range of 0-100% = 4-20 mA.
3.4.2 Calibration Mode
Calibration mode allows for sensor zero and span adjustments. “1-ZERO 2-SPAN”
3.4.2.1 Zero Adjustment
Zero is set in ambient air with no combustible gas present or with zero gas applied to the sensor. “AUTO ZERO”
3.4.2.2 Span Adjustment
Unless otherwise specif ied, span adjustment is performed at 50% LEL methane in air. “AUTO SPAN”
3.4.3 Program Mode
The program mode provides a program status menu, allows for the adjustment of alarm set point levels, the selec-
tion of the target gas K factor, the selection of the calibration gas K factor and the selection of the calibration gas
level setting.
3.4.3.1 Program Status
The program status scrolls through a menu that displays:
* The gas type, range of detection and software version number. The menu item appears as: “LEL 0-100 V6.4”
* The alarm set point level of alarm 1. The menu item appears as: “ALM1 SET @ ##%”
* The alarm f iring direction of alarm 1. The menu item appears as: “ALM1 ASCENDING” or descending.
* The alarm relay latch mode of alarm 1. The menu item appears as: “ALM1 NONLATCHING” or latching.
* The alarm relay energize state of alarm 1. The menu item appears as: “ALM1 DE-ENERGIZED” or energized.
* The alarm set point level of alarm 2. The menu item appears as: “ALM2 SET @ ##%”
* The alarm f iring direction of alarm 2. The menu item appears as: “ALM2 ASCENDING” or descending.
* The alarm relay latch mode of alarm 2. The menu item appears as: “ALM2 LATCHING” or nonlatching.
* The alarm relay energize state of alarm 2. The menu item appears as: “ALM2 DE-ENERGIZED” or energized.
* The alarm relay latch mode of the fault alarm. The menu item appears as: “FLT NONLATCHING” or latching.
* The alarm relay energize state of the fault alarm. The menu item appears as: “FLT ENERGIZED” or deenergized.
* Identif ication of the target gas K factor. The menu item appears as: “GAS FACTOR #.##”
* Identif ication of the calibration gas K factor. The menu item appears as: “CAL FACTOR #.##”
* The calibration gas level setting. The menu item appears as: “CalLevel @ xx%”
* Identif ication of the RS-485 ID number setting. The menu item appears as: “485 ID SET @ ##”
* The estimated remaining sensor life. The menu item appears as: “SENSOR LIFE 100%”
3.4.3.2 Alarm 1 Level Adjustment
The alarm 1 level is adjustable over the range 10 to 90%. For combustible gas sensors, the level is factory set at
20%. The menu item appears as: “SET ALM1 @ 20%”
3.4.3.3 Alarm 2 Level Adjustment
The alarm 2 level is also adjustable over the range 10 to 90%. For combustible gas sensors, the level is factory set at
40%. The menu item appears as: “SET ALM2 @ 40%”
3.4.3.4 Target Gas Selection
The target gas K factor is adjustable over the range 0.79 to 5.65. For combustible gas sensors conf igured for the
detection of methane, the level is factory set at 1.00. The menu item appears as: “GAS FACTOR 1.00”
3.4.3.5 Calibration Gas Selection
The calibration gas K factor is adjustable over the range 0.79 to 5.65. For combustible gas sensors that are calibrated
using methane, the level is factory set at 1.00. The menu item appears as: “CAL FACTOR 1.00”
Model FP-624C Combustible Gas Sensor PG.7