An averaging sensor integrates multiple sensing junctions or elements along its length, producing a single output that represents the average temperature across the measured space. Thermometrics supplies averaging thermocouples and Pt100 RTD assemblies for HVAC duct averaging, air handler coil temperature, large-tank average bulk temperature, and dryer/oven uniformity monitoring.
Multiple thermocouple junctions connected in series-parallel configuration within a single sheath. The resultant EMF is the true arithmetic average of all junctions — not a spatial average from a single measurement point. Junctions are distributed along the length at equal pitch. Type K standard, all standard types available.
A Pt100 resistance element wound along the full sensing length, so the measured resistance represents the spatially averaged temperature along that length. Far more accurate averaging than a multi-junction TC approach when resistance is uniform along the sensor. Available in flexible silicone-jacketed or rigid stainless tube construction.
A rigid stainless steel capillary tube housing a continuous Pt100 wound element, designed for direct insertion across an HVAC duct or air handler plenum. Flanged or NPT process connection at one end, sealed tip at the other. NEMA 4X connection head or direct lead wire. Available in 1ft increments from 1ft to 10ft insertion length.
| Parameter | AVG-TC-1 | AVG-RTD-1 & 2 |
|---|---|---|
| Junctions / Element | 2 to 8 junctions, series-parallel | Continuous wound Pt100 |
| Length | 6" to 120" | 6" to 20ft (custom) |
| Accuracy | ASTM E230 Std tolerance | IEC 60751 Class B (±0.3°C @ 0°C) |
| Sheath | 316SS, flex PVC, or MIMS | Silicone flex or 316SS rigid |
| Temp Range | Type K: −40°C to 400°C (PVC sheath) | −50°C to 200°C (silicone flex) |
| Wire Config | 2-wire (junctions in parallel) | 3-wire standard; 4-wire available |
| Process Connection | NPT, compression, or direct mount | NPT, flanged, direct duct mount |
| Application | Return air, furnace zone, tank bulk | HVAC duct, air handler, dryer |
A multi-junction TC averages temperature at discrete, fixed points. A wound-wire RTD averages the entire length continuously. For HVAC duct averaging where spatial uniformity is unknown, the wound-wire RTD provides a more representative average. For furnace zone monitoring where specific measurement points are important, the multi-junction TC approach is preferred. Both technologies are available from Thermometrics.
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