Vaisala HMM100 Humidity Module For Environmental Chambers


  • Full temperature compensation over the operating temperature range of -70 °C … +180 °C (-94 °F … +356 °F)
  • High-temperature tolerance, also suitable for heat sterilization
  • HUMICAP 180R sensor
  • Easy field calibration by trimmers
  • Applications: test chambers, incubators

Dpstar is a leader in environmental and industrial measurements. Curiosity and innovation are core values in our company. Our extensive knowledge and expertise are materialized in our selection of innovative products. Accurate measurements are essential for healthy indoor air and improving the energy efficiency of buildings. The unique, cutting-edge Dpstar sensor technologies are manifested throughout our versatile range of products. The transmitters have an exceptionally long lifetime and excellent measurement stability, thus being practically maintenance-free. These are among the many reasons why Dpstar’s products are a sustainable choice.

Vaisala HMM100 Humidity Module is designed to be integrated into environmental chambers. It offers a single analog output channel for either relative humidity (RH) or dew point (Td). Two types of probes are available: stainless steel or plastic. The plastic probe comes in two sizes, standard and extended (400 mm long), with various cable lengths available up to 3 meters. Both probes use the HUMICAP 180R sensor, ensuring accurate measurements.


  • Excellent measurement accuracy
  • Low-maintenance
  • Easy to install
  • Durable

Robust & Reliable

Vaisala HMM100 probe works in freezing conditions (-70 °C (-94 °F) and also in temperatures up to +180 °C (+356 °F). HMM100 is easy to install and the probe can be freely placed in a test chamber as the speed of airflow does not affect the measurement.

Low Maintenance

Compared to psychrometers, Vaisala HMM100 requires very little maintenance. There is no wick that needs changing and there is no need for a water tank or water pump. Thus, environmental stress screening can be done reliably.


The accessories available are a component board mounting bracket with a lid, probe clamp, USB cable for service use, a module housing, and a probe mounting flange.



The Vaisala HMM100 Humidity Module is designed to be easily integrated into environmental chambers. It offers a single analog output channel for measuring relative humidity (RH) or dew point (Td). The module, featuring the HUMICAP 180R sensor, is practically maintenance-free and ensures excellent measurement accuracy.


Relative Humidity
Measurement range 0 … 100 %RH
Factory calibration uncertainty (+20 °C / +68 °F) ±1.5 %RH
Humidity sensor types HUMICAP 180R
Accuracy (1)
at −20 … +40 °C (−4 … +104 °F) ±2 %RH (0 … 90 %RH)
±3 %RH (90 … 100 %RH)
at −40 … −20 °C and +40 … +180 °C (−40 … −4 °F and +104 … +356 °F) ±2.5 %RH (0 … 90 %RH)
±3.5 %RH (90 … 100 %RH)
Dew Point Temperature
Measurement range −20 … +100 °C (−4 … +212 °F) Td
Accuracy (2)  ±2 °C (±3.6 °F) Td
1) Including non-linearity, hysteresis, and repeatability.
2) Including non-linearity, hysteresis, and repeatability, when dew point depression is < +20 °C (+68 °F) (ambient temperature – dew point).
Operating Environment
EMC compliance Applicable parts of EN61326-1, generic environment
Operating Temperature
Component board −5 … +55 °C (+23 … +131 °F)
Stainless steel probe
Plastic probe (standard body)
Plastic probe (extended 400‑mm (16‑in) body)
−70 … +180 °C (−94 … +356 °F)
−70 … +180 °C (−94 … +356 °F)
−70 … +120 °C (−94 … +248 °F)
Plastic grid and membrane filter −20 … +80 °C (−4 … +176 °F)
Porous PTFE, stainless steel sintered, and PPS plastic grid with stainless steel net filter −70 … +180 °C (−94 … +356 °F)
Service cable connector M8 4-pin male
Probe diameter 12 mm (0.5 in)
Probe Cable Lengths
Stainless steel probe 0.6/1.55/2.9 m (2/5.1/9.5 ft)
Plastic probe (standard body) 0.6/1.55/2.9 m (2/5.1/9.5 ft)
Plastic probe (extended 400‑mm (16-in) body) 1.55 m (5.1 ft)
Probe Material
Stainless steel probe AISI316/PPS
Plastic probe PPS
Extension tube for 400‑mm probe POM
Probe mounting clamp AISI316
Mounting Bracket Material
Bottom plate Al
Module housing material ABS/PC (cover)
Inputs and Outputs
Power consumption 6 mA
Operating Voltage
2-wire model 24 VDC
3-wire model 10 … 35 VDC or 24 VAC ±20 %
15 … 35 VDC or 24 VAC ±20 % when
0 … 10 V output is used
Analog Output Types (1 Output Selectable)
2-wire model 4 … 20 mA (loop-powered)
3-wire model 0 … 20 mA, 0 … 1/5/10 V, 1 … 5 V
Max. wire size 0.5 … 1.5 mm2 (AWG)
Service port M8 connector for USB cable
Spare Parts and Accessories
HUMICAP 180 sensor (1) 15778HM
Plastic grid filter 6221
Membrane filter 10159HM
Porous PTFE filter 219452SP
Stainless steel sintered filter HM47280SP
PPS plastic grid with stainless steel net filter DRW010281SP
Mounting bracket with lid 225979
Module housing (IP65) 226060
Probe mounting flange 226061
Probe mounting clamp set (10 pcs) 226067
USB cable 226068
(1) Spare part item name: INTERCAP humidity sensor


Vaisala HMM100 Humidity Module For Environmental Chambers_DpstarGroup