BAPI Immersion Temperature Sensors Catalog Page

Immersion Temperature Sensors (

BA/#-I)

Installation & Operations

20907_ins_Immersion_Passive

Overview and Identication

The Immersion Sensor is made for thermowell mounting and temperature measurement in water pipes, water tanks or
cooling tower sump applications. The rigid probe is made of Stainless Steel and made in different lengths for a custom
thermowell t. The unit 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.

Fig 3: BAPI-Box 4 (BB4) Immersion

(A Pierceable Knockout Plug is available

Fig 1: BAPI-Box (BB) Immersion Fig 2: BAPI-Box 2 (BB2) Immersion

from BAPI for the open port in the BB4.

Part #BA/PKP-100)

rev. 06/29/15

Fig 4: Weather Tight (EU) Immersion Fig 5: Weatherproof (WP) Immersion

6.5 Inches
Overall Probe Length

Fig 7: Machined Bar Stock ThermoWell

Threadolet

Fig 6: J-Box Immersion (Standard)

2 Inch Thick
Pipe Insulation

1/2 Inch Thick
Pipe Wall
(Schedule 80)

4 Inch Insertion

Fig 8: Two Part Welded Well

Weld

Fig 9: Typical Installation Identication and Dimensions

Specications subject to change without notice.

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20907_ins_Immersion_Passive

Mounting

Immersion Temperature Sensors (

Installation & Operations

BA/#-I)

rev. 06/29/15

T-Pipe Fitting

Fig 10: Typical

T-Mount

Hand Tighten Into Well

Fig 12: Typical Sensor Inserted

Fig 14: BB2 Sensor Before Insertion

Per Order

Sensor Slides

*

Reducer

1/2 Inch NPT

1/2 Inch NPT

Reducer

Fig 11: Typical Corner Mount

Per Order

Sensor Slides

*

1. Pull Sensor to
Extend Fully

2. Insert

3. Hand Tighten

Fig 13: BB & BB4 Sensor Before Insertion

Per Order

Sensor Slides

*

T-Pipe Fitting

1. Pull Sensor to
Extend Fully

2. Insert

3. Hand Tighten

1. Pull Sensor to
Extend Fully

2. Insert

3. Hand Tighten

Fig 15: WP Sensor Before Insertion

Per Order

Sensor Slides

*

1. Pull Sensor to
Extend Fully

2. Insert

3. Hand Tighten

Fig 16: Standard J-Box Before Insertion

*As the box is hand screwed, the probe will push into the box as the probe tip bottoms out in the well. The probe can slide up to 1.6 inches.

Specications subject to change without notice.

Fig 17: EU Sensor Before Insertion

Per Order

Sensor Slides

*

1. Pull Sensor to
Extend Fully

2. Insert

3. Hand Tighten

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Immersion Temperature Sensors (

BA/#-I)

Installation & Operations

20907_ins_Immersion_Passive

Mounting continued....

• Application: Figure 9 shows a typical four-inch thermowell and four-inch immersion probe installed into an eight inch
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 with the plastic screw tting into the opening on the well.
Hand tighten the immersion sensor snugly without too much torque. Make sure that the tip of the immersion sensor is
in contact with the bottom of the well by pushing on the top of the probe, without damaging the wires, to bottom out the
probe in the thermowell. The unit is designed so that the temperature probe slides in the junction box as the sensor hits
the bottom of the well.

Wiring & Termination

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.

rev. 06/29/15

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. 20:

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

Fig. 19: 3 Wire Lead Wire Termination for RTD

Fig. 21:

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

Specications subject to change without notice.

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20907_ins_Immersion_Passive

Diagnostics

Problems:

Controller reports higher or
lower than actual temperature.

Specications

Immersion Temperature Sensors (

BA/#-I)

Installation & Operations

rev. 06/29/15

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.

Sensor: Passive
Thermistor, 2 wire
RTD, 2 or 3 wire

Thermistor Thermal resistor (NTC)
Temp. Output Resistance Per Order1
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 Temp Device (PTC)
Platinum (Pt) 100Ω and 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
click “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

Lead wire 22awg stranded

Insulation Etched Teon, Plenum rated
Probe Rigid, 304 Stainless Steel,

0.25” OD

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

Mounting ½” NPSM Plastic Threads

Enclosure Types

J-Box -JB, w/eight ½” knockouts
No Box -NB, intended for open wiring
Weather Proof -WP, w/ two ½” FNPT entries, (Bell box)
BAPI-Box -BB, w/four ½” NPSM & one ½” drill-out
BAPI-Box 2 -BB2, w/three ½” NPSM & three ½” drill-outs

BAPI-Box 4: -BB4, w/ three ½” drill-outs & one ½” open port

Weather Tight -EU, -EUO, w/two ½” knockouts

Enclosure Ratings

J-Box -JB, NEMA 1
No Box -NB, No rating
Weather Proof -WP, NEMA 3R, IP14
BAPI-Box -BB, NEMA 4X, IP66
BAPI-Box 2 -BB2, NEMA 4X, IP66

BAPI-Box 4 -BB4, IP10
(IP44 with Knockout Plug in the open port)

Weather Tight -EU, NEMA 4X, IP66
Weather Tight -EUO, NEMA 4X, IP66, UV rated

Enclosure Materials

J-Box -JB, Galvanized steel, UL94H-B
No Box -NB, Nylon 66, UL94H-B
Weather Proof -WP, Cast Aluminum, UV rated
BAPI-Box -BB, Polycarbonate, UL94V-0, UV rated
BAPI-Box 2 -BB2, Polycarbonate, UL94V-0, UV rated
BAPI-Box 4: -BB4, Polycarbonate & Nylon, UL94V-0
Weather Tight -EU, ABS Plastic, UL94V-0
Weather Tight -EUO, ABS Plastic, UL94V-0, UV rated

Ambient (Encl.) 0 to 100% RH, Non-condensing
All BAPI-Boxes

-BB, BB2, BB4, -40ºF to 185ºF, (-40º to 85ºC)
Weather Tight -EUO, EU, -40ºF to 185ºF, (-40º to 85ºC)
J-Box & No Box -JB, NB, -40ºF to 212ºF, (-40º to 100ºC)
Weatherproof -WP, -40ºF to 212ºF, (-40º to 100ºC)

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.