User Guide

Printed in U.S.A. 9/08 © Copyright 2008 TAC All Rights Reserved. F-24534-2
The 2232-150 Duct Mounted Relative Humidity Transmitter is
designed to measure relative humidity in an air duct and to
transmit a 3 to 15 psig signal over its 0 to 100% R.H. span to
remote controlling, indicating and alarm devices such as
receiver-controllers, receiver gauges and sensitive pressure
switches. The pressure versus relative humidity curve is
shown in Figure 1.
The 2232-150 is a one-pipe, force-balance transmitter which
utilizes an external restrictor in a supply line. It incorporates a
highly sensitive hygroscopic nylon ribbon element and a ball
valve for pneumatic feedback which ensures accuracy
stability over the entire operating range. All internal parts are
corrosion resistant and there is an internal filter to maintain
cleanliness of operating parts. These features, along with
simplified design and small movement of operating parts,
provides an instrument with a long, maintenance-free life.
SPECIFICATIONS
Range: 0 to 100% R.H.
Action: direct, proportional.
Adjustments: see calibration instructions.
Main air pressure: 20 psig operating, 30 psig maximum.
Output pressure: 3 to 15 psig.
Ambient Temperature Limits:
Shipping & storage, -40 to 150°F (-40 to 65°C).
Operating,
Head (outside duct) 40 to 150°F (4 to 60°C)
Sensing element (inside duct) -20 to 140°F (-29 to
60°C).
Connections: 1/8" - 27 FNPT.
Sensitivity: see page 2.
Table-1 Ordering Information.
TAC
Wholesale
Number
Replaces
Model
Range Comments
2232-150 H150-100
0 to 100%
R.H.
Includes one each
21-596, 21-597 &
21-598 overlays & 2 No.
8 sheetmetal screws.
Table-2 Accessories.
TAC
Wholesale
Number
Replaces
Model
Description
20-944 N4-32 Restrictor tee, copper tubing
21-038 N100-0010 Restrictor tee, polyethylene tubing
21-153 N100-2501 In-line restrictor
GENERAL INSTRUCTIONS
This device is to be used on dry control air only, and will
operate properly when mounted in any position.
The inherent reliability of this device is enhanced and
prolonged through regular inspection and preventive
maintenance by a qualified control expert. Should this device
become inoperative, it should be replaced by a new unit.
Caution: This device should be installed by a qualified
person with due regard for safety, as improper installation
could result in a hazardous condition.
SENSITIVITY
The output of the 2232-150 is non-linear. To determine the
sensitivity of this device for calculating authority, the following
method should be used:
1. Determine the desired throttling range for the receiver
controller (Example: 10%).
2. Determine the desired setpoint (Example: 50% R.H.).
3. The throttling range becomes 45 to 55% R.H. Refer to
Figure 1 and note that the output at 55% R.H. is 6.69 psig
and at 45% R.H. it is 5.55 psig. This is a difference of
1.14 psig and equals the (TR x sensitivity) figure needed
to calculate authority for receiver controller applications.
2232-150
Duct Humidity Transmitter
Data Sheet