BAPI Double Threaded Immersion Units Catalog Page

Double Threaded Immersion Units with Stainless Steel Fittings

BA/#-Ix-SS Temperature Sensor

Installation & Operations

20908_ins_ImrsnDblThread_Passive

Overview

The BA/#-Ix-SS Double Threaded Stainless Steel (SS) Immersion Sensor 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 BA/#-Ix-SS is available with multiple thermistor’s or RTD’s as shown in the specications. Enclosure
mounting styles come in plastic or metal for both NEMA 1 and NEMA 4 applications and are all plenum rated.

Identication

rev. 06/29/15

Fig 1: BAPI-Box (BB) Standard Mount

Fig 4: BAPI-Box (BB) Outside Mount Fig 5: BAPI-Box 2 (BB2) Outside Mount Fig 6: Weatherproof (WP) Outside Mount

Fig 2: BAPI-Box 2 (BB2) Standard Mount

Fig 3: Weatherproof (WP) Standard Mount

Fig 7: No Box (NB) Units

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 Immersion Units with Stainless Steel Fittings

BA/#-Ix-SS Temperature Sensor

Installation & Operations

rev. 06/29/15

T-Pipe Fitting

Fig 10: Typical T-Mount

Reducer

1/2 Inch NPT

Hand Tighten Into Well

Fig 12: Typical Sensor Inserted

1/2 Inch NPT

Reducer

Fig 11: Typical Corner Mount

1. Insert

2. Hand Tighten

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

T-Pipe Fitting

1. Insert

2. Hand Tighten

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

1. Insert

2. Hand Tighten

Fig 16: Standard J-Box Before Insertion

Fig 15: Weatherproof (WP) Sensor Before Insertion

Fig 17: Weather Tight (EU) Sensor Before Insertion

Specications subject to change without notice.

1. Insert

2. Hand Tighten

1. Insert

2. Hand Tighten

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Double Threaded Immersion Units with Stainless Steel Fittings

BA/#-Ix-SS Temperature Sensor

Installation & Operations

20908_ins_ImrsnDblThread_Passive

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 website www.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 website www.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.

Wiring & Termination

rev. 06/29/15

BAPI recommends using twisted pair of at least 22AWG and sealant lled connectors for all wire connections. Larger
gauge wire may be required for long runs. All wiring must comply with the National Electric Code (NEC) and local codes.
Do NOT run this device’s wiring in the same conduit as high or low voltage AC power wiring.

BAPI’s tests show that inaccurate signal levels are possible when AC power wiring is present in the same conduit as the
sensor wires.

To Controller
Analog Input (AI)

Thermistor

or RTD
Sensor

Fig. 18: 2 Wire Lead Wire Termination for Thermistor or RTD

(No Polarity)

To Controller
Analog Input (AI)
(No Polarity)

Fig. 19: 3 Wire Lead Wire Termination for RTD

Fig. 20:

Terminal Strip (-TS)
Option for 2 Wire
Sensors Termination

Specications subject to change without notice.

Fig. 21:

Terminal Strip (-TS)
Option for 3 Wire
Sensors Termination

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Double Threaded Immersion Units with Stainless Steel Fittings

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Wiring & Termination continued...

BA/#-Ix-SS Temperature Sensor

Installation & Operations

rev. 06/29/15

Fig. 22:

Test & Balance (-TB) Option
for 2 Wire Sensors Termination

Diagnostics

Problems:

Controller reports higher or
lower than actual temperature

Possible Solutions:

- Conrm the input is set up correctly in the front end software

- Check wiring for proper termination & continuity. (shorted or open)

- Disconnect wires and measure sensor resistance and verify the “Sensor” output is correct.

Specications

Sensor Passive
Thermistor NTC, 2 wire
RTD PTC, 2 or 3 wire

Thermistor Thermal resistor
Temp. Output Resistance
Accuracy (Std) ±0.36ºF, (±0.2ºC)
Accuracy (Hi) ±0.18ºF, (±0.1ºC), [XP] option
Stability < 0.036ºF/Year, (<0.02ºC/Year)
Heat dissipation 2.7 mW/ºC
Temp. Drift <0.02ºC per year
Probe range -40º to 221ºF (-40º to 105ºC)

RTD Resistance Temperature Device
Platinum (Pt) 100Ω or 1KΩ@0ºC, 385 curve,
Platinum (Pt) 1KΩ@0ºC, 375 curve
Pt Accuracy (Std) 0.12% @Ref, or ±0.55ºF, (±0.3ºC)
Pt Accuracy (Hi) 0.06% @Ref, or ±0.277ºF,
(±0.15ºC), [A]option

Pt Stability ±0.25ºF, (±0.14ºC)
Pt Self Heating 0.4 ºC/mW @0ºC
Pt Probe range -40º to 221ºF, (-40 to 105ºC)
Nickel (Ni) 1000Ω@70ºF, JCI curve
Ni Probe range -40º to 221ºF (-40 to 105ºC)

Sensitivity Approximate @ 32ºF (0ºC)
Thermistor Non-linier
Go to bapihvac.com “Sensor Specs”
RTD (Pt) 3.85Ω/ºC for 1KΩ RTD

0.385Ω/ºC for 100Ω RTD
Nickel (Ni) 2.95Ω/ºF for the JCI RTD

Fig. 23:

Test & Balance (-TB) Option
for 3 Wire Sensors Termination

Lead Wire 22awg stranded

Wire Insulation Etched Teon, Plenum rated

Probe Rigid, 316 Stainless Steel, 0.25” OD

Probe Length 2”, 4”, 8” or custom per order

Mounting 1/2” NPT, 316 Stainless Steel

Double Threaded Fitting

Enclosure Types
Weatherproof -WP, w/ two ½” FNPT entries, (Bell box)
BAPI-Box -BB, w/four ½” NPSM & one 1/2” Drill-outs
BAPI-Box 2

-BB2, w/three ½” NPSM & three 1/2” Drill-outs

Enclosure Ratings

No Box -NB, No Rating (Probe Only)
Weatherproof -WP, NEMA 3R, IP14
BAPI-Box -BB, NEMA 4, IP66
BAPI-Box 2 -BB2, NEMA 4, IP66

Enclosure Materials

Weatherproof -WP, Cast Aluminum, UV rated
BAPI-Box -BB, Polycarbonate, UL94V-0, UV rated
BAPI-Box 2 -BB2, Polycarbonate, UL94V-0, UV rated

Ambient (Encl.)

0 to 100% RH, Non-condensing
Weatherproof -WP, -40ºF to 212ºF, (-40º to 100ºC)
BAPI-Box -BB, -40ºF to 185ºF, (-40º to 85ºC)
BAPI-Box 2 -BB2, -40ºF to 185ºF, (-40º to 85ºC)

Agency

RoHS, *CE
PT= DIN43760, IEC Pub 751-1983,
JIS C1604-1989

*Passive Thermistors 20KΩ and smaller are

CE Compliant

Specications subject to change without notice.

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