BAPI Duct Averaging Transmitters Catalog Page

Duct Averaging Transmitters

BA/T#-A Temperature Transmitter

Installation & Operations

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Overview

The BA/T#-A is a exible averaging duct mounted 4-20mA or Voltage transmitter probe. It comes in a variety of probe
lengths and optional mounting enclosures shown below. The 4-20mA transmitter can be ordered with 100Ω (385), 1KΩ
(385) RTDs or 10KΩ type 2 thermistor sensors. A 0-5VDC or 0-10VDC transmitter is also available with the 10KΩ type
2 thermistor sensor. Special high accuracy RTD matched transmitters (M) are available which match the sensor to the
transmitter for improved accuracy.

Identication

rev. 06/27/17

Fig 1: Flexible Probe Bracket (BA/FPB)

(Order Separately)

Fig 3: Duct Averaging Unit with Weatherproof (WP) Enclosure

Fig 2: Duct Averaging Unit with J-Box (Standard)

Fig 4: Duct Averaging Unit with BAPI-Box (BB) Enclosure

Fig 5: Duct Averaging Unit with BAPI-Box 2 (BB2) Enclosure

Specications subject to change without notice.

Fig 6: Duct Averaging Unit with Weather Tight (EU) Enclosure

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Duct Averaging Transmitters

BA/T#-A Temperature Transmitter

Installation & Operations

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Mounting

1. Place the sensor in the middle or top of the duct as shown in Fig. 7 or Fig. 8 so the exible probe can enter the duct in
a convenient place. Drill the probe and mounting holes as depicted for the enclosure being used. (Handy Box, BB,

BB2, WP, EU).

2. Insert the probe by unrolling the sensor into the duct carefully to avoid kinking the sensor. Serpentine the duct with

the sensor at least twice across the stratied air in the duct to achieve the best average temperature reading. At the
sensor reversing points a BAPI Flexible Probe Bracket (BA/FPB - order separately) can be used to support the sensor
and to avoid kinking the sensor.

3. Mount the enclosure to the duct using BAPI recommended #8 screws through a minimum of two opposing mounting
tabs provided. Weatherproof (WP) enclosures will require assembly of the mounting tabs on opposite corners. A 1/8
inch pilot screw hole in the duct makes mounting easier through the mounting tabs. Use the enclosure tabs to mark
the pilot hole locations.

4. Snug up the sensors so that the foam backing is depressed to prevent air leakage but do not over-tighten or strip the
screw threads.

Note 1: Be sure not to drill into the weatherproof enclosures (BB,BB2,WP,EU,EUO) which will violate the NEMA and/or

the IP rating.

Note 2: Be sure to use caulk or Teon tape for your conduit entries to maintain the appropriate NEMA or IP rating for your

application.

Note 3: Conduit entry for outdoor or wet applications should be from the bottom of the enclosure.

rev. 06/27/17

Fig 7: Averaging Sensor Horizontal Mount. Best for

Vertical Stratication.

Specications subject to change without notice.

Fig 8: Averaging Sensor Vertical Mount. Best for

Horizontal Stratication.

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