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Panametrics
Panametrics DewPro MMR31 Moisture Transmitter
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Loop-powered moisture; 0–100% RH; dew point –15…85 °C; IP67. RFQ + selection help.
Download datasheet PDF
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Key parameters
Transmitter Type
Loop-powered 4–20 mA moisture transmitter
Sensing Element
Silicon-based polymer capacitive sensor
Rh Range
0 to 100% RH
Rh Accuracy
±2% (0–90% RH); ±3% (90–100% RH) at 25 °C
Dew Point Range
–15 to 85 °C
Dew Point Accuracy
±1 °C above 0 °C dew point @ 25 °C
Fits loop-powered process moisture measurement where you need a Panametrics DewPro MMR31 with 0–100% RH, dew point −15 to 85 °C, and a Type 4X / IP67 316 SS probe.
Key advantages
- Type — Loop-powered 4–20 mA moisture transmitter
- RH — 0–100% RH; ±2% (0–90%), ±3% (90–100%) at 25 °C
- Dew point — −15 to 85 °C; ±1 °C above 0 °C DP @ 25 °C
- Other — Absolute humidity 1–350 g/m³; mixing ratio 1–830 g/kg
- Probe / enclosure — 316 SS ½ in tube, 75–150 mm insertion; Type 4X / IP67; to 250 psia
Typical applications
- Process air and gas humidity monitoring.
- Dew-point control loops on 4–20 mA.
- Hazardous-area options (FM Ex / ATEX Zone 2).
Selection guide
- Output variables — RH / dew point / absolute humidity / mixing ratio scaling
- Display — Integral display yes/no
- Second loop — Temperature loop option
- Approvals — FM Ex / ATEX Zone 2 needs
Common mistakes
- Expecting cryogenic dew points below −15 °C DP range.
- Ignoring 250 psia max operating pressure.
- Wrong insertion length for duct/pipe.
When to RFQ / what to tell us
- Variable (RH/DP/AH); P/T; insertion.
- Display/Ex options; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 22427 |
| Brand | Panametrics |
| Model | DewPro MMR31 Moisture Transmitter |
| Product type | Moisture Transmitter |
| Type | Loop-powered 4–20 mA moisture transmitter |
| Sensor | Silicon-based polymer capacitive sensor |
| RH range | 0 to 100% RH |
| RH accuracy | ±2% (0–90% RH); ±3% (90–100% RH) at 25 °C |
| Dew point range | –15 to 85 °C |
| Dew point accuracy | ±1 °C above 0 °C dew point @ 25 °C |
| Absolute humidity | 1 to 350 g/m³ |
| Mixing ratio | 1 to 830 g/kg |
| Max pressure | 250 psia (17 bar) |
| Power | 24 VDC nominal (12–30 VDC) |
| Enclosure | Type 4X / IP67 |
| Probe | 316 SS 1/2 in tube; insertion 75–150 mm |
| Options | Integral display; second temperature loop; FM Ex / ATEX Zone 2 |
Documents
FAQ
Q: Power? A: 24 VDC nominal (12–30 VDC), loop-powered 4–20 mA.
Q: Dew-point range? A: −15 to 85 °C.
Q: What should I send for a quote? A: Variable/P/T/insertion, options, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Transmitter Type | Loop-powered 4–20 mA moisture transmitter |
| Sensing Element | Silicon-based polymer capacitive sensor |
| Rh Range | 0 to 100% RH |
| Rh Accuracy | ±2% (0–90% RH); ±3% (90–100% RH) at 25 °C |
| Dew Point Range | –15 to 85 °C |
| Dew Point Accuracy | ±1 °C above 0 °C dew point @ 25 °C |
| Absolute Humidity Range | 1 to 350 g/m³ |
| Mixing Ratio Range | 1 to 830 g/kg |
| Max Operating Pressure | 250 psia (17 bar) |
| Power | 24 VDC nominal (12–30 VDC) |
| Enclosure | Type 4X / IP67 |
| Probe | 316 SS 1/2 in tube; insertion 75–150 mm |
| Options | Integral display; second temperature loop; FM Ex / ATEX Zone 2 |
| Datasheet | PANA065DS Rev. 3 (06/2026) |