BAPI Double Threaded Stainless Steel Immersion Transmitters Catalog Page

Double Threaded Stainless Steel Immersion Transmitters

BA/T# -Ix-SS Temperature Transmitter

Installation & Operating Instructions

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Overview

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The BA/#-Ix-SS Double Threaded Stainless Steel (SS) Immersion Transmitter is made for thermowell mounting and
temperature measurement in water pipes, water tanks or cooling tower sump applications. Direct probe insertion into a
Threadolet is possible without a thermowell. However, this is not recommended as it cannot be removed after the pipe is
pressurized. The rigid probe and threads are made of Stainless Steel and made in different lengths for a custom thermowell
t. The 4 to 20mA transmitter can be ordered with 100Ω (385), 1KΩ (385) RTDs or 10KΩ type 2 thermistor sensors. A 0
to 5VDC or 0 to 10VDC transmitter is also available with the 10KΩ type 2 thermistor sensor. Special high accuracy R
matched transmitters (M) are available which match the sensor to the transmitter for improved accuracy. Enclosure
mounting styles come in plastic or metal for both NEMA 3R and NEMA 4 applications and are all plenum rated.

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Identication

rev. 06/30/15

TD

Fig 1: Double Threaded Immersion Sensor

in a BAPI-Box (BB) Enclosure

Fig 4: Double Threaded Immersion Sensor

in a BAPI-Box (BBO) Enclosure with
“Outside Mount” Conguration.

Fig 2: Double Threaded Immersion Sensor

in a BAPI-Box 2 (BB2) Enclosure

Fig 5: Double Threaded Immersion Sensor

in a BAPI-Box 2 (BB2O) Enclosure
with “Outside Mount” Conguration.

Fig 3: Double Threaded Immersion Sensor

in a Weatherproof (WP) Enclosure

Fig 6: Double Threaded Immersion

Sensor in a Weatherproof (WPO)
Enclosure with “Outside Mount”
Conguration.

Fig 7: Double Threaded Stainless

Steel Immersion Probe Only

Fig 8: Machined Bar Stock

Thermowell

Specications subject to change without notice.

Fig 9: Two Part Welded Thermowell

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Mounting

Double Threaded Stainless Steel Immersion Transmitters

BA/T# -Ix-SS Temperature Transmitter

Installation & Operating Instructions

rev. 06/30/15

T-Pipe Fitting

Fig 10: Typical T-Mount

Fig 12: Typical Sensor Inserted

Per Order

Reducer

1/2 Inch NPT

Hand Tighten Into Well

1/2 Inch NPT

Fig 11: Typical Corner Mount

1. Insert

2. Hand Tighten

Fig 13: BAPI-Box (BB) Model Before Insertion

Per Order

Reducer

Per Order

T-Pipe Fitting

1. Insert

2. Hand Tighten

Fig 14: BAPI-Box 2 (BB2) Model Before Insertion

Fig 15: Weatherproof (WP) Sensor Before Insertion

1. Insert

2. Hand Tighten

Application: Figure 12 shows a typical thermowell and immersion probe installed into a pipe. In a properly insulated pipe
with liquid or steam, the temperature is essentially the same across the entire cross section of the pipe. Usually thermowells
are sized to extend to the center of the pipe; however, shorter thermowells will give proper temperature readings if properly
insulated. The shorter thermowells are used in pipes with high ow velocities. See Application notes “Thermowells Explained” on
our web site BAPIHVAC.com.

Thermowell Installer: Typically a Pipe Fitter drills a ¾-inch hole into the pipe where the thermowell is needed. A customer
provided tting, called a Threadolet or Weldolet, is welded to the pipe over the hole. The Threadolet has a ½” NPT thread in the
center. Thread sealant such as Teon tape or pipe dope is applied to the ½” NPT threads of the thermowell. The thermowell is
then inserted into the Threadolet and tightened. Estimates on insertion depths can be seen in our Application note “Thermowells
Explained” on our web site BAPIHVAC.com

Sensor Installation: Insert the immersion sensor into the well. Hand tighten the immersion sensor snugly without too much
torque. The probe is tight tting to the bottom and wall of the thermowell offering an accurate temperature reading.

Direct probe insertion into the pipe without a thermowell is possible. However, this is not recommended as it cannot be removed
after the pipe is pressurized. Apply a minimum of ve turns of Teon tap to the SS probe side threads. Insert the SS probe and
½” NPT threads into the Threadolet and tighten with a wrench to achieve a water tight seal. The probe should not touch the far
inside of the water pipe or probe failure may occur.

Specications subject to change without notice.

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