Omega IMMERSION Series Regulating Immersion Heaters
PRECAUTIONS
DO NOT RUN THE WIRING IN ANY CONDUIT WITH LINE VOLTAGE (24/120/230 VAC).
GENERAL INFORMATION
The Immersion sensor is a single-point temperature sensor that is designed for use with electronic controllers in commercial heating and cooling building management systems. It is available with multiple thermistor or RTD options.
For optimal temperature readings, follow these tips:
- Apply thermal grease to the end of the probe before installation into the 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 be installed 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. The bestpractice 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. Refer to the Wiring Instructions (p. 2-3) to make necessary connections.
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 insertion length of the pipe is 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 well failure. Machined thermowell (-IM) should be used in these types of applications. Fabricated thermowells are intended for tank, or low to nno-flow applications.
TABLE 1: PROBE LENGTH and INSERTION LENGTH
| ACI PART # | IMMERSION LENGTH | PROBE LENGTH |
| A/xx-I-2.5”-yy-zz | 2.5” (63.50 mm) | 4.31” (109.47 mm) +/- 0.13” (3.30 mm) |
| A/xx-I-4”-yy-zz | 4.0“ (101.60 mm) | 5.81“ (147.57 mm) +/- 0.13” (3.30 mm) |
| A/xx-I-6”-yy-zz | 6.25” (158.75 mm) | 7.81” (198.37 mm) +/- 0.13” (3.30 mm) |
| MAXIMUM VELOCITY VS THERMOWELL INSERTION LENGHT 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 max pressure of 5700 PSI. (Calculated to ASME PTC 19.3 TW-2016 Code B31.1) | Note 3: 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
Open the cover of the enclosure. ACI recommends 16 to 26 AWG twisted pair wires or shieldedcablese for all sensors. Signal wiring must be ruseparatelyte from low and high voltage wires (24/120/230VAC). All ACI thermistors and RTD temperature sensors are both non-polarity and non-position sensitive.
All thermistor-type units are supplied with (2) flying lead wires, and all RTDs are supplied with (2) or (3) flying lead wires – see FIGURE 6 (pg. 4). The number of wires needed depends on the application.C onnect thermistor/RTD wire leads to controller analog input wires using wire nuts, terminal blocks, or crimp-style connectors. All wiring must comply with all local and National Electric Codes. After wiring, attach the cover to the enclosure.
Note: When using a shielded cable, be sure to connect only (1) end of the shield to the ground at the controller. Connecting both ends of the shield to the ground may cause a ground loop. When removing the shield from the sensor end, make sure to properly trim the shield to prevent any chance of shorting.
Note: If the controller requires a (2) wire input for an RTD, connect the (2) common wires(same color) together. If the controller requires (3) wires, use (3) individual wires.
TROUBLESHOOTING
| Sensor reading is incorrec.t | • Verify sensor wiring to the controller is not damaged and has continuity.
• Verify sensor or wires are not shorted together. • Verify controller is set for cthe orrect sensor curve. • Disconnect sensor wires, and take a resistance reading with a multimeter. • Compare the resistance reading to the Temperature vs. resistance Curves online: http://www.workaci.com/content/thermistor- curves-0 • Verify proper mounting location to confirm no external factors are affecting reading. |
|
| Sensor reads infinity/very high resistance | • Sensor or wires are open | |
| Sensor reads low-resistance | • Sensor or wires are shorted together | |
| Erratic readings | • Condensation on PCB board
• Bad wire connections |
|
WARRANTY
The ACI Immersion Series temperature sensors are covered by ACI’s Five (5) Year Limited Warranty, which is located in the 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 ofit with household waste. Do not burn.
PRODUCT SPECIFICATIONS
| SENSOR NON-SPECIFIC | |||
| Number Sensing Points: | One | ||
| Storage Temperature Range: | -40 to 85 °C (-40 to 185 °F) | ||
| Operating Humidity Range: | 0 to 90% RH, non-condensing | ||
| Probe Diameter | Thermowell Bore Diameter: | 0.250” (6.35mm) | 0.260” | ||
| Probe Material | Thermowell Material: | 304 Stainless Steel | 304 Series Stainless Steel | ||
| Wire Size | 22 AWG (0.65 mm) | ||
| Thermowell Instrument | Process Thread Size: | ½” NPS (National Pipe Straight) Female Thread | ½” NPT (National Pipe Tapered) Male Thread | ||
| 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) |
||
| THERMISTOR | |||
|
Sensor Output @ 25ºC (77ºF): (Lead Wire Colors) *Does not include CL2P |
A/1.8K: 1.8 KΩ nominal (Red/Yellow)
A/3K: 3 KΩ nominal (White/Brown) A/AN (Type III): 10 KΩ nominal (White/White) A/AN-BC: 5.238 KΩ nominal (White/Yellow) A/CP (Type II): 10 KΩ nominal (White/Green) A/50K: 50KΩ nominal (Brown/Yellow) |
A/CSI: 10 KΩ nominal (Green/Yellow) A/10KS: 10 KΩ nominal (White/Blue) A/10K-E1: 10 KΩ nominal (Gray/Orange) A/20K: 20 KΩ nominal (Brown/Blue) A/100KS: 100 KΩ nominal (Black/Yellow) | |
| Accuracy 0-70ºC (32-158ºF): | A/1.8K Series: +/- 0.5 °C @ 25 °C (77 °F)
and (+/-1.0 °C) (+/-1.8 °F) |
A/10K-E1 Series: +/- 0.3 °C (+/- 0.54 °F)
All Else: +/- 0.2 °C (+/- 0.36 °F) |
|
| PLATINUM | |||
| Sensor Output @ 0°C (32°F): | A/100: 100 Ω nominal | A/1K: 1 KΩ nominal | |
|
Accuracy: |
+/- 0.06% Class A (Tolerance Formula: +/- °C = (0.15 °C + (0.002 * |t|))
where |t| is the absolute value of Temperature above or below 0 °C in °C) |
||
| @ -40 °C (-40 °F): +/- 0.23°C (+/- 0.414 °F)
@ 0 °C (32 °F): +/- 0.15°C (+/- 0.27 °F) |
|||
| @ 200 °C 392 °F): +/- 0.55 °C (+/- 1.00 °F) | |||
| BALCO | |||
| Sensor Output @ 21.1 °C (70 °F): (Lead Wire Colors) | 1 KΩ nominal (Orange/Yellow) | ||
| Accuracy: | @ 21.1 °C (70 °F): +/- 1% | ||
| NICKEL | |||
| Sensor Output @ 21.1 °C (70 °F): (Lead Wire Colors) | 1 KΩ nominal (Red/Red) | ||
|
Accuracy: |
@ -40 °C (-40 °F): +/- 1.52 °C (+/- 2.73 °F)
@ 0 °C (32 °F): +/- 0.4 °C (+/- 0.72 °F) @ 21.1 °C (70 °F): +/- 0.17 °C (+/- 0.34 °F) |
@ 54.4 °C (130 °F): +/- 0.56 °C (+/- 1. 00°F)
@ 121 °C (250 °F): +/- 1.25 °C (2.25 °F) |
|
Automation Components, Inc.
2305 Pleasant View Road
Middleton, WI 53562
Phone: 1-888-967-5224
Website: workaci.com
Documents / Resources
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Omega IMMERSION Series Regulating Immersion Heaters [pdf] Instruction Manual IMMERSION Series Regulating Immersion Heaters, IMMERSION Series, Regulating Immersion Heaters, Immersion Heaters, Heaters |
