Johnson Controls AD-1272 - User Manual

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AD-1272 Advanced Thermal Dispersion Probe Airflow Measuring System

Technical Bulletin

1

Document Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Navigating the Start-Up Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Membrane Pushbuttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Navigating the Menu Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Navigating the Operator Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Enable, Disable, and Change the Operator PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Flow Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Display Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Updating Display Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Selecting Custom Text. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Analog Output 1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Updating Analog Output 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Analog Output 2 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Updating Analog Output 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Temperature Output LPF (Low Pass Filter). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Updating Temperature Output LPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Flow Output LPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Updating Low Output LPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Analog Output Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Configuring the Analog Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Temperature Balance Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

K-Factor Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Configuring the K-Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

AD-1272 Advanced Thermal Dispersion Probe Airflow

Measuring System

Technical Bulletin

AD-1272

Code No. LIT-12012477

Issued December 2017

Table of Contents

Questions and Answers

L
Larry AyersAug 4, 2025
Why don't airflow readings match T&B reports in Johnson Controls Measuring Instruments?
- T
  twoodardAug 5, 2025
  If airflow readings from Johnson Controls Measuring Instruments don't match the T&B report, it may be due to turbulent or non-uniform airflow. To resolve this, use Automatic K-factor Configuration and use 1 point calibration if only gain is required. If flow is non-linear use two or three-point calibration feature. You may also need to install additional probes, move the probes to a better location, or check for leaks in the duct.
J
Joseph WalkerAug 11, 2025
What to do if there is no display on Johnson Controls AD-1272 Measuring Instruments?
- K
  Kristin ReevesAug 11, 2025
  If your Johnson Controls Measuring Instruments display is blank, first verify that the 24 VAC power is present at the power terminal and that the ribbon cable is fully seated in the board’s socket. Also, visually inspect the membrane to ensure it's properly plugged into the display board in the lid.
J
James AndradeAug 19, 2025
Why does Johnson Controls Measuring Instruments show the wrong number of probes?
- B
  Becky McbrideAug 19, 2025
  If Johnson Controls Measuring Instruments show an incorrect number of probes, the probe network wiring might be incorrect, or the plug might be in the wrong port. Verify the wiring using the probe network wiring information in the AD-1272 Thermal Dispersion Probe Airflow Measuring Station Installation Instructions (LIT-12012552). Also, check that the left and right terminals are not swapped and that connections are correct on the board. Ensure each ancillary probe has a unique address by checking the rotary dial position, as duplicate addresses on the Probe Network can cause this issue.
G
Gregory HuangAug 27, 2025
How to fix no BACnet communication with BAS on Johnson Controls Measuring Instruments?
- L
  Lindsay YoungAug 27, 2025
  If there is no BACnet communication with the BAS in Johnson Controls Measuring Instruments, verify the wiring using the BACnet wiring information in the AD-1272 Thermal Dispersion Probe Airflow Measuring Station Installation Instructions (LIT- 12012552). Check that the left and right terminals are not swapped. Also, verify that the configuration parameters in the BACnet Network Configuration settings match what is required to communicate with the BAS.

Summary

Navigating the Operator Menu

Enable Operator PIN

Flow Configuration

Configures system variables like duct size, shape, elevation, and process units.

Display Configuration

Analog Output 1 Parameters

Selects process variables (flow, temp, none) for Analog Output 1.

Analog Output 2 Parameters

Selects process variables (flow, temp, none) for Analog Output 2.

Analog Output Calibration

Adjusts the span and offset for Analog Outputs 1 and 2 for resolution.

Temperature Balance Configuration

K-Factor Configuration

Enables K-Factor calculation/selection and configures gain and offset values.

BACnet Configuration

Configures BACnet settings and enables/disables BACnet communication.

BACnet Flow Alarm Configuration

Configures flow alarm setpoints, deadband, and delay for BACnet.

BACnet Temperature Alarm Configuration

Configures temperature alarm setpoints, deadband, and delay for BACnet.

Flow Configuration

Duct Setup

Configures duct shape, diameter, width, height, and area.

Display Configuration

Analog Output 1 Parameters

Updating Analog Output 1

Analog Output 2 Parameters

Updating Analog Output 2

Temperature Output LPF (Low Pass Filter)

Flow Output LPF

Analog Output Calibration

Output 1 Offset

Sets the zero point (offset) for Analog Output 1 (e.g., 0.000 mA).

Output 1 Low Span

Sets the low end of the span for Analog Output 1 (e.g., 4 mA).

Output 1 High Span

Sets the high end of the span for Analog Output 1 (e.g., 20 mA).

Output 2 Offset

Sets the zero point (offset) for Analog Output 2 (e.g., 0.000 mA).

Output 2 Low Span

Sets the low end of the span for Analog Output 2 (e.g., 4 mA).

Output 2 High Span

Sets the high end of the span for Analog Output 2 (e.g., 20 mA).

Design Range Low

Sets the low range value for output flow spanning.

Design Range High

Sets the high range value for output flow spanning.

Temperature Range Low

Temperature Range High

Configuring the Analog Output

Temperature Balance Configuration

Temperature Balance Enable

Temperature Offset Selection

K-Factor Configuration

K-Factor Enable?

Option to turn the K-Factor calculation on or off.

Calculate K-Factor?

Selects whether to calculate K-Factor automatically or manually.

Manual Gain

Manually updates or enters the K-Factor gain value.

Manual Offset

Manually updates or enters the K-Factor offset value.

Number of Data Points

System at Point 1

Point 1 Velocity

System at Point 2

Point 2 Velocity

System at Point 3

Point 3 Velocity

Generate K-Factor

Calculates and displays the K-Factor gain and offset values.

Configuring the K-Factor

BACnet Network Configuration

BACNet On;Off

BACnet Instance

BACnet Address

BACnet Objects

BACnet Flow Alarm Configuration

Alarm Deadband Setpoint

Alarm Delay

BACnet Temperature Alarm Configuration

Alarm Low On;Off

Alarm High On;Off

Alarm Low Setpoint

Alarm High Setpoint

Navigating the Supervisor Menu

Enable Supervisor PIN

Sensor Management

Factory Default

Sensor Management

Scan for Sensors

Reset Sensor Network

Factory Default Reset

Troubleshooting

Johnson Controls AD-1272 Specifications

General

Accuracy	±1% of Full Scale
Type	Differential Pressure Transmitter
Output Signal	4 to 20 mA
Power Supply	12 to 30 VDC
Application	HVAC systems