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# Temperature Sensor - Quick Reference SSO

**Device Type:** Analog Input - Sensor

**Signal:** Thermistor (10K) / 0-10VDC / 4-20mA

**Power:** Unpowered (thermistor) / 24VAC-VDC (transmitter)

**Version:** 1.0 | **Date:** Dec 2025

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## DEVICE OVERVIEW

**Common Models:**

- Johnson Controls TE-6000, Honeywell T7350, Siemens QAA, Belimo 22RT, BAPI BA/10K

**Used For:**

Space temperature, duct air temp, immersion (water/glycol), outdoor air sensing

**Wire Type:** 18AWG minimum, 16AWG recommended, shielded if >50ft

**Environment:** Space 32-120°F | Duct -40-200°F | Immersion -40-250°F

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## SAFETY - PPE REQUIRED

- ☑ Safety glasses (ANSI Z87.1)

- ☑ Cut-resistant gloves (sheet metal)

- ☑ Hard hat (mechanical rooms/rooftops)

- ☑ Dust mask (drilling ducts)

- ☑ Fall protection (if >6 feet height)

### HAZARDS

- ⚠ Sharp edges - Sheet metal ductwork

- ⚠ Hot/cold surfaces - Ducts near coils, pipes

- ⚠ Falls - Ladder work, rooftop access

- ⚠ Rotating equipment - Air handler fans (LOTO required)

### LOCKOUT/TAGOUT

- [ ] **Required for duct sensors:** Lock out air handler before drilling duct

- [ ] Notify building operator

- [ ] Lock breaker with personal lock

- [ ] Test that fan won't start

- [ ] Remove lock only after work complete

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## INSTALLATION CHECKLIST

### TOOLS NEEDED

- Drill + bits (1/16"-1/2")

- Hole saw (3/4"-1" for duct)

- Wire strippers (18-16 AWG)

- Multimeter (DMM)

- Level, tape measure

- Deburring tool

- Duct sealant (high-temp)

- Label maker

### PRE-INSTALL

- [ ] Location per blueprints verified

- [ ] Space sensor: Away from sun, exterior walls, diffusers (6ft), doors (3ft)

- [ ] Duct sensor: Straight section (3× duct diameter from elbows)

- [ ] Outside sensor: North wall, away from exhaust (10ft)

- [ ] Correct sensor type for controller input (thermistor vs transmitter)

### INSTALL STEPS - SPACE SENSOR

1. **Mount:** 48-60" above floor, interior wall, use level

2. **Route Wire:** Through wall/conduit, 12" service loop

3. **Terminate (Thermistor 2-wire):**

   - Wire 1 (Red): Terminal 1

   - Wire 2 (Black): Terminal 2

   - Polarity doesn't matter for thermistor

4. **Terminate (Transmitter 3-wire):**

   - Red: +24VAC/VDC

   - Black: Common/Ground

   - White/Green: Signal output

5. **Label:** "RM-[#]-TEMP" both ends

6. **Install cover** and verify level

### INSTALL STEPS - DUCT SENSOR

1. **LOCKOUT air handler** before starting

2. **Mark location:** Straight duct, avoid seams/ribs

3. **Drill penetration:** Pilot hole → Hole saw → Deburr edges

4. **Insert probe:** 1/3 duct width (spot) or full width (averaging)

5. **Secure flange:** Sheet metal screws, tight but not distorted

6. **Seal penetration:** High-temp duct sealant, no air leaks

7. **Terminate wiring:** Per sensor type (above)

8. **Restore system:** Remove lockout, verify fan starts

### INSTALL STEPS - IMMERSION SENSOR

1. **Verify thermowell** present in pipe

2. **Apply thermal compound** to probe tip

3. **Insert probe** fully into thermowell

4. **Tighten compression fitting:** Hand tight + 1/4 turn with wrench

5. **Terminate wiring** and support with cable ties

### POST-INSTALL

- [ ] Device mounted securely and level

- [ ] All wires tight (7-9 in-lbs torque)

- [ ] Labels applied both ends

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- [ ] Duct penetrations sealed (no leaks)

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- [ ] Work area cleaned

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- [ ] Photos taken

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---

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## EXPECTED READINGS

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### PRE-POWER (Power OFF)

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**THERMISTOR (2-wire, unpowered):**

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- **Resistance at 70°F:** 9,500 - 10,500 ohms (10K Type II/III)

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- **At 60°F:** ~12,500 ohms

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- **At 80°F:** ~8,000 ohms

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- **If infinity:** Open circuit - failed sensor or broken wire

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- **If near zero:** Short circuit

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**TRANSMITTER (3-wire):**

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- **Continuity:** Each wire <5 ohms end-to-end

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**ISOLATION:** >10K ohms to ground (all types)

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### POWER-UP

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**THERMISTOR:**

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- Controller provides excitation (~5VDC)

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- Controller converts resistance to temperature

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**TRANSMITTER:**

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- **Supply Voltage:** 24VAC/VDC ±10% (21.6-26.4V acceptable)

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- **Output at 70°F (0-10V, 0-100°F range):** ~7.0V

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- **Output at 70°F (4-20mA, 0-100°F range):** ~15.2mA

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### ACCEPTABLE RANGE - SPACE TEMP

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- ✓ Reading: 68-72°F at room temp (±2°F initially acceptable)

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- ✓ Response time: 30-90 seconds to stabilize

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- ✓ Controller shows reading (no faults)

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- ✓ Graphics display live value

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### TYPICAL READINGS - DUCT

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- **Supply Air Cooling:** 50-60°F

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- **Supply Air Heating:** 90-120°F

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- **Return Air:** 68-76°F

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- **Outside Air:** Matches local weather (±5°F)

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### TYPICAL READINGS - IMMERSION

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- **Chilled Water Supply:** 42-48°F

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- **Chilled Water Return:** 52-58°F

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- **Hot Water Supply:** 140-180°F

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- **Condenser Water:** 70-95°F

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---

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## PROOF OUT TESTS

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### TEST 1: Response Test

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- **Do:** Place hand over space sensor (or heat duct sensor with breath)

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- **Expect:** Reading increases 3-8°F within 30-60 seconds

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- **Pass If:** Reading changes and returns to baseline when removed

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### TEST 2: Accuracy Check

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- **Do:** Compare to calibrated reference thermometer (within 6")

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- **Expect:** Reading within ±2°F of reference

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- **Pass If:** Within tolerance after 5 min stabilization

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### TEST 3: Stability Check

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- **Do:** Monitor reading for 5 minutes

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- **Expect:** Stable reading (±1°F variation max)

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- **Pass If:** No erratic jumping or oscillation

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### TEST 4: Controller Integration

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- [ ] Device appears in controller point list

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- [ ] Reading displays correctly (no faults)

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- [ ] Graphics show live data updating

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- [ ] Control system responds to sensor (heating/cooling calls)

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---

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## TROUBLESHOOTING

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### NO POWER / NO READING / FAULT

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1. **Thermistor:** Measure resistance at sensor: Should be ~10K at 70°F

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   - If infinity: Replace sensor (open circuit)

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   - If near zero: Replace sensor (short circuit)

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2. **Transmitter:** Check supply voltage at sensor: 24V ±10%

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3. Test continuity end-to-end: <5 ohms

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4. Check all terminal connections tight

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5. Verify polarity correct (transmitters only)

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6. **If still dead:** Replace device

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### READING TOO HIGH OR LOW (Offset)

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1. Compare to calibrated reference thermometer

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2. **Space sensor:** Check for influences:

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   - Direct sunlight, heat sources, cold surfaces

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   - Too close to diffuser (<6ft) or exterior wall

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3. **Duct sensor:** Verify insertion depth (1/3 width typical)

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4. **Immersion sensor:** Verify probe fully inserted in thermowell

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5. Wait 30 min for stabilization

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6. **If consistently off by same amount:** Apply controller calibration offset

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7. **If off by >5°F:** Relocate or replace sensor

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### ERRATIC / JUMPING READINGS

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1. Check all terminal connections tight (wiggle test)

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2. Inspect wiring for damage, pinching

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3. **Check for EMI/RFI interference:**

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   - Wire running parallel to power cables?

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   - Near motors, VFDs, transformers?

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4. Verify shielded cable used if required (>50ft runs)

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5. Test at sensor AND at controller (same reading?)

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6. Look for moisture in connections

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7. **If wiring OK:** Replace sensor

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### SLOW RESPONSE

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1. Normal: 30-90 seconds for most sensors

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2. **Duct sensor:** May be outside airstream - check depth

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3. Check for buildup on sensor element

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4. **If >2 minutes consistently:** Clean or replace

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---

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## ESCALATION - COMPLETE BEFORE CALLING

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### PRE-ESCALATION CHECKLIST

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- [ ] Verified supply voltage at sensor (transmitters: 24V ±10%)

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- [ ] Tested sensor resistance (thermistors: ~10K at 70°F)

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- [ ] Verified all wire connections tight and correct

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- [ ] Tested continuity end-to-end (<5 ohms)

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- [ ] Compared to calibrated reference thermometer

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- [ ] Checked for environmental influences

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- [ ] Verified sensor type matches controller input config

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- [ ] Documented all readings with multimeter

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- [ ] Taken photos of installation and wiring

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- [ ] Reviewed sensor installation manual

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### PROVIDE THIS INFO

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- **Device:** [Mfg / Model / Location]

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- **Sensor Type:** Thermistor / 0-10V / 4-20mA

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- **Measured Resistance:** _____ ohms (thermistors)

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- **Supply Voltage:** _____ V (transmitters)

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- **Output Signal:** _____ V or mA

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- **Controller Reading:** _____ °F

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- **Reference Reading:** _____ °F

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- **Error:** _____ °F (sensor - reference)

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- **Environment:** Temp ____ / Humidity ____ / Airflow ____

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- **Steps Taken:** [List troubleshooting completed]

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- **Photos:** Attached to Service Fusion ticket

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### CONTACTS

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- **Field Specialist:** [Phone]

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- **Programmer:** [Phone] (if calibration offset needed)

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- **Project Manager:** [Phone] (if design/location issue)

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- **Dispatch:** [Phone] (parts/resources)

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## CALIBRATION

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**When Required:** All sensors verified during commissioning, annually for critical apps

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**Quick Steps:**

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1. **Stabilize:** Wait 15-30 min (space), 30 min (duct with system running)

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2. **Position reference:** Within 6" of sensor, same height/location

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3. **Wait:** 2-3 min for reference to stabilize

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4. **Compare:**

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   - Sensor reading: ______°F

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   - Reference reading: ______°F

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   - Error: ______ °F

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5. **Acceptable:** ±2°F for most BAS, ±1°F for tight tolerance apps

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**If Outside Tolerance:**

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- **Option A (Preferred):** Apply controller calibration offset

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  - Access controller config for this input

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  - Enter offset value (+ if sensor reads low, - if reads high)

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  - Verify reading now matches reference

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  - Document offset in Service Fusion

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- **Option B:** Adjust sensor (if has calibration pot)

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  - Remove cover, locate adjustment screw

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  - Adjust while monitoring reading

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  - Re-verify with reference

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- **If Cannot Calibrate:** Replace sensor

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**Document:** Tech name, date, reference ID & cal date, before/after readings

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## COMMON ISSUES & TIPS

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✓ **Space sensors reading high:** Check if in direct sun or near heat source

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✓ **Duct sensors inaccurate:** Verify insertion depth (1/3 width for spot sensing)  

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✓ **Outdoor sensors erratic:** Ensure north-facing, away from exhaust/relief dampers  

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✓ **Immersion sensors slow:** Normal - thermal mass requires 15-20 min to respond  

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✓ **All sensors offset same amount:** Apply controller calibration offset, don't replace  

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✓ **Shielded cable:** Ground shield at controller end ONLY (not both ends)

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✓ **10K Type II vs Type III:** Most controllers auto-detect, but verify in config

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---

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**Document ID:** SSO-TEMP-001

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**Revision:** 1.0

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**Next Review:** Dec 2026