Detcon PI-500 User Manual
Page 18
3.6 O
PERATING
S
OFTWARE
& M
AGNETIC
I
NTERFACE
Operating software is menu listed with operator interface via the two magnetic program switches located under the face
plate. The two switches are referred to as “PGM 1” and “PGM 2”. The menu list consists of 3 items which include sub-
menus as indicated below. (Note: see section 3.7 for a complete software f low chart.)
01.
Normal Operation
a) Current Status
02.
Calibration Mode
a) Zero
b) Span
03.
Program Menu
a) View Program Status
b) Set Calibration Level
c) Set Response Factor
d) Set Zero Offset
3.6.1 Normal Operation
In normal operation, the display tracks the current status of the sensor and gas concentration and appears as:
“0 PPM xxx”
(the “xxx” is the abbreviated gas type, ie., “0 PPM VOC”. The mA current output corresponds to the
monitoring level of 0-100% of range = 4-20 mA.
3.6.2 Calibration Mode
Calibration mode allows for sensor zero and span adjustments.
“1-ZERO 2-SPAN”
3.6.2.1 Zero Adjustment
Zero is set in ambient air with no target gas present or with zero gas applied to the sensor.
“AUTO ZERO”
3.6.2.2 Span Adjustment
Span adjustment is performed with a target gas concentration of 50% of range in air. Span gas concentrations other than
50% of range may be used. Refer to section 3.6.3.2 for details.
“AUTO SPAN”
3.6.3 Program Mode
The program mode provides a program status menu (View Program Status) to check operational parameters. It also
allows for the adjustment of the calibration gas level setting.
3.6.3.1 Program Status
The program status scrolls through a menu that displays:
* The software version number.
* Range is ###
* The calibration gas level setting. The menu item appears as:
“CalLevel @ xxPPM”
* The response factor setting. The item appears as:
“RespFactor = x.xx”
* The current zero offset value. The menu item appears as:
“ZeroOffset = x.x PPM”
* The raw signal from the sensor head. The menu item appears as:
“Raw Signal = x.xx V”
* The estimated remaining sensor life. The menu item appears as:
“SENSOR LIFE 100%”
3.6.3.2 Calibration Level Adjustment
The calibration level is adjustable from 10% to 90% of range. The menu item appears as:
“CalLevel @ ##PPM”
3.6.3.3 Response Factor Adjustment
The Response Factor is set according to the primar y target gas being detected. The menu item appears as:
“RespFactor = x.xx”
PI-500 Toxic Gas Sensors PG.18