IMMERSION SERIES
TEMPERATURE TRANSMITTER
Installation & Operation Instructions
Phone: 1-888-967-5224
Website: workaci.com
GENERAL INFORMATION
The ACI Immersion Series sensors and transmitters are single-point sensors that output 4-20 mA with an optional voltage signal output of 1-5VDC or 2-10VDC signal to BAS or controller. All ACI/TT and TTM temperature transmitters can be powered from either an unregulated or regulated 8.5 to 32 VDC power supply.
MOUNTING INSTRUCTIONS
For optimal temperature readings, follow these tips:
- Apply thermal grease to the end of the probe before installation into thermowell (ACI Item #102595).
- The tip of the thermowell should be located in the middle of the pipe.
- The sensor thermowell should be installed against the flow of the water, where the water temperature is well mixed (no stratification).
- Make sure the entire thermowell is immersed. If the thermowell is longer than the pipe diameter, the thermowell should be installed in an elbow or Tee.
THERMOWELL INSTALLATION
ACI’s standard Immersion sensors are made to install into a ½” NPT female thread. Typically a Threadolet or Tee is installed into the pipe, but a hole can also be drilled and tapped. The pipe/system will need to be drained unless a Hot Tap is being used. The recommended drill size is 23/32 in. (18 mm). Drill the hole, and tap the hole with
½”-14NPT.
Always use proper thread sealants on tapered pipe threads of the thermowell. Screw the thermowell into the Threadolet, Tee, or tapped hole, using a wrench to tighten it firmly. Refill the system and check for leaks.
Best practice is to apply thermal grease to the end of the probe, but not required. Insert and push the sensor probe into the thermowell. Turn the sensor probe assembly clockwise to tighten down completely.
FIGURE 1: ENCLOSURE DIMENSIONS PLASTIC BOX (-PB)
GALVANIZED ENCLOSURE (-GD)
BELL BOX (-BB)
NEMA -4X (-4X)
FIGURE 2: THREADOLET ASSEMBLY
FIGURE 3: ELBOW ASSEMBLY
FIGURE 4: TEE MOUNT ASSEMBLY
PROBE INSERTION
The immersion sensors “-I” include a welded thermowell but can be ordered without the thermowell “-INW” version. The “-INW” includes a standard ½” NPS process thread to be used with a machined thermowell or previously installed thermowell. Verify the existing thermowell and the insertion length of the pipe are suitable for your selected Immersion.
If the length of the probe is too large, the probe may be pressed into its enclosure – up to an inch of clearance.
Note: *Fabricated (welded) thermowells (-I) are not intended for moving water or high-pressure service. Fluid velocity and wake frequency are primary factors in good failure. Machined thermowells (-IM) should be used in these types of applications. Fabricated thermowells are intended for tank, or low to no flow, applications.
FIGURE 5: PROBE and IMMERSION
TABLE 1: PROBE LENGTH and INSERTION LENGTH
| ACI PART# IMMERSION LENGTH | PROBE LENGTH | |
| AffTxx-INW-2.5″-yy-zz | 2.5″ (63.50 mm) | 4.31′(1 09.47 mm) +1- 0.13′ (3.30 mm) |
| AffTxx-INW-4″-yy-zz | 4.0″ (101.60 mm) | 5.81″ (147.57 mm) +1- 0.13’13.30 mm) |
| AffTxx-INW-6″-yy-zz | 6.25″(158.75 mm) | 7.81′(19837 mm) +/- 0.13*(3.30 mm) |
| MAXIMUM VELOCITY VS THERMOWELL INSERTION LENGTH MACHINED THERMOWELL | ||||||||||
| Straight Shank Insertion Length “U“ | Stepped Shank Insertion Length “U“ | |||||||||
|
Material: |
Media Type: |
1.0″ (25.4 mm) |
2.5″ (63.5 mm) |
8.0″ (203.2 mm) |
4.0” (101.6 mm) |
6.0″ (152.4 mm) |
12.0″ (304.8 mm) |
18.0″ (457.2 mm) |
24″ (609.6 mm) |
|
|
304/316 SS |
Air/Gas/Steam1 |
349 ft/s
(106.3 m/s) |
349 ft/s
(106.3 m/s) |
71.9 ft/s (21.9 m/s) | 109 ft/s
(33.2 m/s) |
73.6 ft/s (22.4 m/s) | 19.4 ft/s (5.9m/s) | 8.8 ft/s (2.7m/s) | 5.2 ft/s (1.6m/s) | |
|
304/316 SS |
Water |
360 ft/s
(109.7 m/s) |
360 ft/s
(109.7 m/s) |
71.9 ft/s (21.9 m/s) | 82.2 ft/s (25.1 m/s) | 26.9 ft/s (8.2 m/s) | 11.3 ft/s (3.4m/s) | 4.7 ft/s (1.43m/s) | 2.5 ft/s (0.8m/s) | |
Note¹: Values are for Air/Gas/Steam and similar density media based upon Max pressure of 2900 PSI @ 1000ºF (537.8ºC)
Note²: Values are for Water (No Glycol or other Chemicals factored in) @ 68 ºF (20ºC) and a max pressure of 5700 PSI. (Calculated to ASME PTC 19.3 TW-2016 Code B31.1) | Note³: 6-24” Machined Thermowells meet ASME PTC 19.3 TW-2016 Code B31.1.
| MAXIMUM PRESSURE VS TEMPERATURE RATINGS TWO-PART FABRICATED | WELDED THERMOWELL | |||||||
| Material: | 70°F (21.1°C) | 200°F (93.3°C) | 400°F (204.4°C) | 600°F (315.6°C) | 800°F (426.7°C) | 1000°F (537.8°C) | 1200°F (648.9°C) |
| 304/316 SS | 982 PSI
(67.7 Bar) |
820 PSI
(56.6 Bar) |
675 PSI
(46.5 Bar) |
604 PSI
(41.6 Bar) |
550 PSI
(37.9 Bar) |
510 PSI
(35.1 Bar) |
290 PSI
(20.0 Bar) |
| MAXIMUM FLUID VELOCITY RATINGS TWO-PART FABRICATED | WELDED THERMOWELL | ||||
| Straight Shank Insertion Length “U“ | ||||
| Material: | Media Type: | 2.5” (63.5 mm) | 4.0” (101.6 mm) | 6.0” (152.4 mm) |
| 304/316 SS | Air/Gas/Steam2 | 169 ft/s (51.5 m/s) | 61 ft/s (18.6 m/s) | 20 ft/s (6.1 m/s) |
| 304/316 SS | Water | 88 ft/s (26.8 m/s) | 20 ft/s (6.1 m/s) | 10 ft/s (3.05 m/s) |
Note²: Values are for Air/Gas/Steam and similar density media
WIRING INSTRUCTIONS
PRECAUTIONS 
- Transmitter is powered by 24 VDC only.
- Remove power before wiring. NEVER connect or disconnect wiring with power applied.
- When removing the shield from the sensor end, make sure to properly trim the shield to
prevent any chance of shorting. - When using a shielded cable, ground the shield ONLY at the controller end. Grounding both ends can cause a ground loop.
- If the 24 VDC power is shared with devices that have coils such as relays, solenoids, or other inductors, each coil must have a MOV, DC Transorb, Transient Voltage Suppressor (ACI Part: 142583), or diode placed across the coil or inductor. The cathode, or banded side of the DC Transorb or diode, connects to the positive side of the power supply. Without these snubbers, coils produce very large voltage spikes when de-energizing which can cause malfunction or destruction of electronic circuits.
WIRING INSTRUCTIONS
Open the cover of the enclosure. ACI recommends 16 to 26 AWG twisted pair wires or shielded cables for all transmitters. Twisted pairs may be used for 2-wire current output
transmitters or 3-wire for voltage output. Refer to FIGURE 6 (right) for wiring diagrams. All wiring must comply with local and National Electric Codes. All ACI TT and TTM temperature transmitters can be powered from either an unregulated or regulated 8.5 to 32VDC power supply. The TT and TTM DO NOT support an AC input. All TT and TTM temperature transmitters are reverse polarity protected. After wiring, attach the cover to the enclosure.
The minimum voltage at the transmitter power terminal is 8.5V after load resistor voltage drop.
- 249 Ω load resistor (1-5 VDC output) =
13.5 V min supply voltage - 499 Ω load resistor (2-10 VDC output) =
18.5 V min supply voltage
Note: Adding extra wire length between the sensor and transmitter board may affect accuracy.
Note: All RTD’s are supplied with (2) or (3) flying lead wires. ACI’s transmitters are supplied with a 2 pole terminal block for RTD sensor connections. When wiring a 3-wire RTD, connect the (2) common wires (same color) together into the same terminal block – see FIGURE 7 (bottom right).
Formula for Number of Transmitters
Several transmitters may be powered from the same supply as shown in FIGURE 8 (p. 4). Each transmitter draws 25mA; refer to the following equation to obtain the number of permissible transmitters:
[# Transmitters] = [Current] / (25 mA).
FIGURE 6: WIRING DIAGRAMS
FIGURE 7: WIRE RTD
FIGURE 8: MULTIPLE TRANSMITTER CONNECTIONS
● = Connections
In1 = Controller Input #1
In2 = Controller Input #2
In3 = Controller Input #3
TROUBLESHOOTING
| TROUBLESHOOTING | |
|
PROBLEM |
SOLUTION(S) |
| No Reading | • No power to board – check voltage at power terminal – should be between +8.5 and 32 VDC. |
| Reading Too Low | • RTD wires shorted. Disconnect wires from the terminal block and check with an ohmmeter. Reading should be close to 100 Ω or 1 KΩ.
• RTD Improper range of the transmitter (too low). Check current or voltage – should be between 4-20 mA, 1-5 V, or 2-10 V. |
| Reading Too High | • RTD opened. Disconnect sensor wires from the terminal block and check with an ohmmeter. Reading should be close to 100 Ω or 1 KΩ.
• Improper range of the transmitter (too high). Check current or voltage – should be between 4-20 mA, 1-5 V, or 2-10 V. |
| Reading is Inaccurate | • Sensor check: Disconnect sensor wires from the terminal block and check with an ohmmeter. Compare the resistance reading to the Temperature vs Resistance curves located on ACI’s website.
• Transmitter check: Make sure sensor wires are connected to the terminal block. Determine that the proper output is being transmitted based on a predetermined span: |
WARRANTY
The ACI Immersion Series temperature sensors is covered by ACI’s Five (5) Year Limited Warranty, which is located in front of ACI’S SENSORS & TRANSMITTERS CATALOG or can be found on ACI’s website: www.workaci.com.
W.E.E.E. DIRECTIVE
At the end of their useful life, the packaging and product should be disposed of via a suitable recycling centre. Do not dispose of household waste. Do not burn.
PRODUCT SPECIFICATIONS
| PRODUCT SPECIFICATIONS | |
| SENSOR NON-SPECIFIC | |
| Storage Temperature Range: | -40 to 85 °C (-40 to 185 °F) |
| Operating Humidity Range: | 10 to 90% RH, non-condensing |
| Lead Length | Conductor Size: | 14” (35.6 cm) | 22 AWG (0.65mm) |
| Lead Wire Insulation | Wire Rating: | Etched Teflon (PTFE) Colored Leads | Mil Spec 16878/4 Type E) |
| Conductor Material: | Silver Plated Copper |
| Thermowell Instrument Thread | Process Thread: | ½” NPS (National Pipe Straight) | ½” NPT (National Pipe Tapered) |
| Enclosure Specifications: (Temperature, Material, Flammability, NEMA/ IP Ratings) |
“-GD” Enclosure: Galvanized Steel, -40 to 121 °C (-40 to 250 °F), NEMA 1 (IP10) “-PB” Enclosure: ABS Plastic, UL94-HB, -30 to 90 °C (-22 to 194 °F), Plenum Rated “-BB” Enclosure: Aluminum, -40 to 121°C (-40 to 250 °F), Plenum Rated, NEMA 3R (IP 14) “-4X” Enclosure: Polystyrene Plastic, UL94-V2, -40 to 70°C (-40 to 158°F), NEMA 4X (IP 66) |
| SENSOR | |
| Sensor Type | Sensor Curve | Sensing Points: | Platinum RTD | PTC (Positive Temperature Coefficient) | One |
| Sensor Output @ 0°C (32°F): | A/TT100/TTM100: 100 Ω nominal | A/TT1K/TTM1K: 1 KΩ nominal |
| RTD Tolerance Class | Accuracy: | +/- 0.06% Class A | (Tolerance Formula: +/- ºC = (0.15 °C + (0.002 * |t|)) where |t| is the absolute value of temperature above or below 0 °C in °C) |
| Din Standard | Temperature Coefficient: | DIN EN 60751 (IEC 751) | 3850 ppm / °C |
| Sensor Stability: | +/- 0.03% after 1000 Hours @ 300 °C (572 °F) |
| Response Time (63% Step Change): | 8 Seconds nominal |
| Sensor Operating Temperature Range: | -40 to 200 °C (-40 to 392 °F) |
| Probe Diameter | Probe Material: | 0.250” (6.35mm) | 304 Stainless Steel |
| TRANSMITTER | |
| Transmitter Supply Voltage | Supply Current: | +8.5 to 32 VDC (Reverse Polarity Protected) | 25 mA minimum 250 Ω Load: +13.5 to 32 VDC | 500 Ω Load: +18.5 to 32 VDC |
| Maximum Load Resistance: | (Terminal Voltage – 8.5 V) | 0.020 A |
| Output Signals: | Current: 4-20 mA (2-Wire) | Voltage: 1-5 VDC or 2-10 VDC (3-Wires) |
| Calibrated Accuracy | Linearity1: | T. Spans < 500 °F (260 °C): +/- 0.2% |
| Thermal Drift2: | T. Spans < 100 °F (38 °C): +/- 0.04%/ °F | T. Spans > 100 °F (38 °C): +/- 0.02% |
| Min./Max. Calibrated Temperature Spans: | Min. T. Span: 50 °F (28 °C) | Max T. Span: 400 °F (204 °C) |
| TTM100/TTM1K Certification Points: | 3 Pt. NIST: 20, 50, & 80% of span | 5 Pt. NIST: 20, 35, 50, 65, & 80% of span |
| Warm Up Time | Warm Up Drift: | 10 Minutes | +/- 0.1% |
| Transmitter Operating Temperature Range: | -40 to 185 °F (-40 to 85 °C) |
| Transmitter Operating Humidity Range: | 0 to 90%, non-condensing |
| Connections | Wire Size: | Screw Terminal Blocks | 16 AWG (1.31 mm2) to 26 AWG (0.129 mm2) |
| Terminal Block Torque Rating: | 0.37 ft-lb (0.5 Nm ) nominal |
Note¹: Transmitter’s calibrated at 71ºF (22ºC) nominal | Note2: Thermal Drift is referenced to 71ºF (22ºC) nominal calibration temperature
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NOTES
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
Version: 4.0
I0000856
Documents / Resources
 |
ACI 102595 Immersion Series Temperature Transmitter [pdf] Instruction Manual 102595 Immersion Series Temperature Transmitter, 102595, Immersion Series Temperature Transmitter |
