PTH40 Probe-Type Humidity Transmitter for Harsh Environment Equipment

The humidity of environmental test chamber, aging test chamber and other equipments is a very important monitoring parameter. There are extreme high and low temperature and high humidity environment during the operation of equipment, which brings great challenges to humidity measurement. The humidity-sensitive element of PTH40 humidity probe is a high molecular humidity-sensitive capacitor, together with PT1000 temperature-sensitive element, which can provide temperature compensation to ensure accurate measurement.

PTH40 is a split probe-type structure with the split cable length of 2m, the transmitter shell is Aluminum alloy, the sheath material is high temperature resistant PTFE, and the probe operating temperature range can reach -70~180℃. In addition, the probe uses a small package to facilitate to install on the equipment. The probe filter is a fast-responding PTFE filter that resists high temperatures and chemical contamination.

Technical Features

Output signal: 4 ... 20mA, 0 ... 10V or RS485

   Filter: PTFE

Signal output: humidity

Shell material: Aluminum alloy

Operating temperature range: -70 ... 180℃


Technical Data

Input and output

Operating voltage

24V DC ±20%

Current output

4 ... 20mA  RL < 500 Ohm

Power consumption

< 30mA (current or voltage output)

Voltage output

... 10V

< 15mA (digital output)

Channel precision: ±0.2%FS

Digital output

RS485 (Modbus RTU)

Measurement Parameter

Measurement range 

... 100%RH

Measurement precision 

±2%RH (0 … 90%RH & 20)

Calibration error

±0.5%RH (0 … 90%RH)

±0.8%RH (40 … 95%RH)

τ63 response time

15s (PTFE filter)

Humidity sensitive element

High molecular polymer humidity-sensitive capacitor

The above precisions are comprehensive precisions, including repeatability, linearity and hysteresis of the measurement, and can be traced to the CNAS standard.

Technical Specification

Wiring connection

The maximum cable diameter of the terminal is 1.5mm2

Probe protection

Stainless steel sintering, H2O2, PTFE

Cable connector

M16*1.5 gland connector (threading diameter 4.5~10mm)

Protection grade

IP65

Shell material

PC (flame-retardant grade UL94-V0) or Aluminium alloy

Electromagnetic compatibility

EN61326-1  EN61326-2-3

Operating temperature

Circuit: -20 ... 60℃

Probe: -70 ... 180℃

Storage temperature

-20 ... 60℃


Data download:

PTH40 Probe-Type Humidity Transmitter for Harsh Environment Equipment Product Manual








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