Honeywell AirScan iR Instruction Manual page 8

Refrigerant sensor for industrial applications

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Table Of Contents

Operation

Pushbutton Operation, LED

Indicators, Adjustment Pots and

Test Points

The Manning AirScan

buttons, and two adjustment pots that are utilized for

navigation of test functions, calibrations, and operating

modes. In addition, a pair of test points is also

provided that assist in the connection to standard

meter leads for use in the upcoming calibration and

diagnostic procedures (see Figure 4).

Figure 4. Board Component Layout

ICSP Programming Port

Zero Adjust

Span Adjust

JP3

Note 1: Checking

ZERO

voltage to sensor

at +24 and GND

SPAN

VDC

Black

Red

SIG

+24

GND

SHLD

JP1

Note 2: Reading

signal at TEST+

TEST +

and TEST-

TEST -

40-200

mVDC

Black

Red

Manning AirScan-iR Refrigerant Sensor

continued

iR has two internal push-

Serial Port

Pushbutton S1

Rx LED

Tx LED

Pushbutton S2

JP2

Draw

Chamber

CALIBRATE

mA FAULT

IR SOURCE

Tubing to

calibration point

•

"Zero" adjustment pot — adjusts output

calibration of the 4 mA nominal resting point.

•

"Span" adjustment pot — adjusts the 20 mA

concentration level or unit span/sensitivity.

•

Pushbutton S1 — used to initiate the auto-zero

function, program the 4 mA output calibration,

and initiate the 4/20 mA loop test.

•

Pushbutton S2 — used to program the span

setting.

•

Test(+) and Test(—) for connection to a DC Volt

meter (see Figure 4, Note 2).

IMPORTANT: The pushbutton(s) must be pressed

the correct number of times and at the correct rate.

•

When a multi-press sequence must be

performed, the button must be pressed rapidly

and evenly, lifting one's finger completely from

the actuator for each consecutive press.

•

For press and hold activations, one's finger

must always be applying a down pressure

without disruption for the specified time in order

to activate the desired mode.

•

See complete details of each operation in other

parts of the manual.

POWER

The AirScan

SYSTEM

5) that blink in specific sequences (see Figure 6 on

FAULT

next page) to indicate sensor operation and

programming modes. A summary of sensor operation

ATMOS

ACTIVE

and programming modes with corresponding LED

blink sequences is shown in Figure 7 on page 10.

Figure 5. LED Layout