Vaisala DMT132 Dew Point Transmitter

Features

  • High accuracy ±1 °C (±1.8 °F) in the measurement range of refrigerant dryers
  • Excellent long-term stability – resistant to compressor oil and most other chemicals thanks to HUMICAP® technology
  • Low power requirements, 10 … 28 VDC
  • Easy to verify functionality with compatible Vaisala DM70 or HM70 hand-held meters
  • Optional LED warning light
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Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala HUMICAP® Dewpoint Transmitter DMT132 is an affordable dew point measurement instrument designed to verify the functionality of refrigerant dryers. The probe has excellent long-term stability and it is resistant to compressor oil. It is especially well suited for OEM dryer manufacturers.

Dimension in mm 

Key Benefits

A Great Match For Refrigerant Dryers

High accuracy in the measurement range of refrigerant dryers and optimal size.

Convenient To Use

Low energy needs and optional LED warning light.

Excellent Long-Term Stability

Resistant to compressor oil and most other chemicals thanks to HUMICAP® technology.

Direct Measurement Cuts Costs

Direct outlet air dew point measurement provides accurate information about dryer functionality and is more reliable than the traditional method of measuring refrigerator temperature only. Knowledge of the real dew point ensures high-quality compressed air at all times and enables customers to optimize dryer capacity. This helps to prevent investment in redundant dryer capacity and avoid unnecessary maintenance and costly malfunctions.

High Accuracy and Long-Term Stability

DMT132 provides optimal performance in the operating range of refrigerant dryers. In the measurement range of -3 … 20 °C (+26.6 … +68 °F), where the refrigerator dryers typically operate, the Td accuracy is ±1 °C (±1.8 °F). The instrument incorporates the proven Vaisala HUMICAP® sensor, which is resistant to compressor oil and most other chemicals, thereby providing excellent long-term stability.

Quick Installation and Easy Field Checking

It takes just a few minutes to install DMT132 directly into a dryer or compressed air line through a G1/2″ ISO thread. Vaisala sampling cells can also be used. The loop-powered electronics mean that wiring is easy and power requirements are low. DMT132 operating voltages can be as low as 10 VDC. Verifying the performance of DMT132 is easy with the compatible Vaisala DM70 or HM70 hand-held meters. The user can perform possible adjustments with Vaisala HMK15 Humidity Calibrator.

Applications

The Vaisala HUMICAP® Dewpoint Transmitter DMT132 is designed to verify the functionality of refrigerant dryers. Knowledge of the real dew point, not just refrigerator temperature, ensures high-quality compressed air at all times and enables optimization of dryer capacity. It is especially well suited for OEM dryer manufacturers. Spot-checking is possible with HM70 or DM70 handheld.

Specification

Measurement Performance
Measurement range -30 … +50 °C (-22 … +122 °F) Td
Accuracy at +20 °C (+68 °F) ±1 °C for -3 … 20 °C (+26.6 … +68 °F) Td 1)
±2 °C for -15 … -3 °C (+5 … +26.6 °F) Td 1)
See accuracy graph below
Typical Response Time at 20 °C (+68 °F) Gas Temperature and 1 Bar Pressure
-14 +3 °C (+7 +37 °F) Td 1 17 s (63 %)
40 s (90 %)
+3 -14 °C (+37 +7 °F) Td 33 s (63 %)
85 s (90 %)
Calculated Variables
Dew point converted to atmospheric
pressure
Tdf atm
1) When dew point is below 0 °C (+32 °F), the transmitter outputs frost point.
Operating Environment
Operating temperature -20 … +60 °C (-4 … +140 °F)
Operating pressure 0 … 20 bar
Relative humidity 0 … 100 %RH
Sample flow rate No effect on measurement accuracy
Measured gases Non-corrosive gases
EMC compliance EN61326-1, Industrial Environment
Outputs
Analog output (scalable) 4 … 20 mA, 2-wire
Resolution for current output 0.002 mA
Accuracy of analog outputs at +20 °C ±0.05 % full scale
Typical temperature dependence ±0.005 % of full scale/ °C
Connector 4-pin M8 (IEC 60947-5-2)
LED indication available for defined dew point limit/error state indication RS-485 serial line for service use
Mechanical Specifications
Sensor Vaisala HUMICAP 180R
Recommended calibration interval (in refrigerant dryer application) 2 years
Mechanical connection G1/2″ ISO
Operating voltage 10 …. 28 VDC
External load Max. 100 Ω for supply voltages < 20 VDC
Max. 500 Ω for supply voltages 20 … 28 VDC
Weight 65 g (2.3 oz)
Housing material PPS + 40 % GF
IP rating IP65 (NEMA 4)
Storage temperature range -40 … +80 °C (-40 … +176 °F)
Start-up time 3 s
Spare Parts & Accessories
Tube filter 230602
Special cover set for HMK15 (calibrator fitting DMT132 and HMP60) 230914
NPT Adapter 210662SP
Sample cells DMT242SC, DMT242SC2, DSC74, DSC74B, DSC74C, DMCOIL
Duct installation flange DM240FA
Cables (several lengths available) HMP50Z032, HMP50Z300SP, HMP50Z500SP, HMP50Z1000SP
Loop powered external display 226476
USB service cable 219690
Connection cable to DM70/HM70 219980
LED plug 230388
ISO 1/2″ plug 218773
NPT 1/2″ plug 222507
Sealing ring set (3 pcs U-seal) 221525SP

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