Detcon FP-524HT User Manual
Page 7
01.
Normal Operation
a) Current Status
02.
Calibration Mode
a) Zero
b) Span
03.
Program Menu
a) Program Status
b) Target gas selection (gas K factor)
c) Calibration gas selection (cal K factor)
d) Calibration Level
e) 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 selection of the target gas K factor, the selection
of the calibration gas K factor, the selection of the calibration gas level setting, and the selection of the bridge volt-
age 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 V#.#”
* 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%”
* Sensor bridge voltage. The menu item appears as:
“BRIDGE @ #.## VDC”
* The estimated remaining sensor life. The menu item appears as:
“SENSOR LIFE 100%”
3.4.3.2 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”
3.4.3.3 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”
3.4.3.4 Calibration Level Adjustment
The Calibration level is adjustable from 10% to 90% LEL. The menu item appears as:
“CalLevel @ ##%”
Factory default setting is 50%.
3.4.3.5 Set Bridge Volts
The bridge voltage is adjustable from 1.80 to 3.10 VDC. The menu item appears as:
“BRIDGE @ #.## VDC”
Model FP-524HT Combustible Gas Sensor PG.7