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Software flowchart, 2 normal operation, 3 calibration mode – Detcon CX-IR User Manual

Page 17: Normal operation, Calibration mode, Figure 11 software flow chart, Figure 12 software flow chart

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Model CX-IR

Software Flowchart

dec

LEGEND:

PGM1 - Program Switch Location #1
PGM2 - Program Switch Location #2

(S) - Momentary Swipe
(M) - Momentary hold of Magnet during text

scroll until the ">" appears, then release

(3) - 3 second hold from ">" prompt
(10) - 10 second hold from ">" prompt

Auto Time-out - 5 seconds

inc - Increase
dec - Decrease

#, ##, ### - numeric values

AutoZero

PGM1 (3)

PGM2 (10)

PGM2 (3)

inc

Auto Time-Out

View Sensor Status

PGM1/2 (3)

PGM1/2 (M)

PGM2 (S)

PGM1/2 (3)

PGM1 (S)

##

AutoTime-out

PGM1/2 (3)

PGM1/2 (M)

Set Gas Type

AutoSpan

Normal Operation

PGM1 (3)

Auto Time-Out

Auto Time-Out

inc

PGM2 (S)

PGM1/2 (3)

PGM1 (S)

##

PGM1/2 (3)

PGM1/2 (M)

Set Autospan Level

dec

inc

PGM1/2 (3)

PGM1 (S)

PGM2 (S)

##

dec

PGM1/2 (3)

PGM1/2 (M)

Set Gas Factor

Status is CX-IR V

Serial Number

Range ###

Auto Span Level ##

Modbus ID ##

Last Cal # Days

Sensor Life ###

Temperature ##

PGM1/2 (M)

Defaults Restored

PGM1/2 (3)

Restore Defaults

Auto Time-Out

dec

inc

PGM2 (S)

PGM1/2 (3)

PGM1 (S)

##

AutoTime-out

PGM1/2 (3)

PGM1/2 (M)

Set Modbus ID

dec

inc

PGM2 (S)

PGM1/2 (3)

PGM1 (S)

##

AutoTime-out

PGM1/2 (3)

PGM1/2 (M)

Bump Test

Figure 12 Software flow chart

3.2 Normal Operation


In normal operation, the Intelligent Transmitter Module (ITM) display will be blank and will display the gas
reading once every 10 seconds for about 2 seconds (normally appear as "0"). At any time, swiping a magnet
across either PGM1 or PGM2 will cause the ITM to display the range and gas type (i.e. "ppm H2S"). If the
sensor is actively experiencing any diagnostic faults, a swipe of the magnet will cause the display to scroll the
fault condition. Refer to Section 5 Service and Maintenance for more information on fault conditions.

3.3 Calibration Mode


Zero and span calibration should be performed on a routine basis (quarterly minimum is advised) to ensure
reliable performance. If a sensor has been exposed to any de-sensitizing gases, or to very high over-range
combustible gas levels, re-calibration should be considered. Unless otherwise specified, span adjustment is
recommended at 50% of the full scale range.

To enter calibration mode hold the magnet over PGM1 for 3 seconds. If the sensor is experiencing a fault
condition the "

►" prompt will not appear until the fault(s) have been displayed. When the ITM enters

CX-IR Instruction Manual

Rev. 1.2

Page 13 of 34