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Vaisala HMD70Y Humidity & Temperature Transmitter for Ducts in HVAC Applications

 
Vaisala HMD70Y
         
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Humidity and temperature 3-wire transmitter for duct mounting with voltage outputs

Features

  • Relative Humidity and Temperature
  • Selectable signal output of 0 ... 1 V, 0 ... 5 V or 0 ... 10 V (HMD70)
  • With optional current module also 0 ... 20 mA (HMD70)
  • 3-wire, voltage output devices (volt range selectable)
  • HUMICAP RH Sensor with uncertainty < ±2%
  • Pt 1000 RTD Class F0.3 IEC 60751 Temperature Sensor
  • IP65 weatherproof electronics housing
  • Factory calibration included as standard
  • Onsite calibration and adjustment via Vaisala HM70 portable
  • Full 0 ... 100 %RH measurement
  • Accuracy up to ±2 %RH
  • Vaisala HUMICAP® Sensor for excellent accuracy and long-term stability, negligible hysteresis and resistance to dust and most chemicals.
  • Temperature compensated
  • IP65 (NEMA 4) housing
  • Also available as temperatureonly transmitters HMD 60T/70T
  • NIST traceable (certificate included)
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List Price: $500.00
Sale: $476.37
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Vaisala HMD60/70 Humidity and Temperature Transmitters

Vaisala HMD70Y Humidity and Temperature Transmitter for Ducts in HVAC Applications

         
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Product Information

Humidity and Temperature Transmitter for Ducts in HVAC Applications, 3-Wire Voltage Outputs

 
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Vaisala HMD70 Relative Humidity and Temperature transmitters offer an economical solution for general purpose RH&T measurement in HVAC and building automation applications. The Vaisala HMD70 incorporates HUMICAP technology for a reliable, stable and accurate indication of relative humidity and temperature in duct systems designed for building ventilation.

Vaisala HMD70 transmitters are suitable for many industrial humidity monitoring applications.  The incorporated HUMICAP sensor is also offered in many more expensive Vaisala RH&T transmitters for its resistance to chemical attack and established stability.
 
A unique feature of the Vaisala HMD70 duct mount transmitter is the ability to remove the electronics without removing the unit from the duct itself.  Additionally calibration can be checked onsite with a Vaisala HM70 portable RH&T sensor.  Adjustment is simply carried out via a potentiometer until reading matches that of the portable reference sensor.

The duct mounted Vaisala HUMICAP® Humidity and Temperature Transmitter HMD70Y is designed for monitoring relative humidity and temperature in energy management systems in buildings. The combination of high accuracy, stability and reliable operation makes this product the ideal choice for demanding applications.

On-site calibration has been made easy with the high precision trimmers and compatibility with the Vaisala HUMICAP® Hand-held Humidity and Temperature Meter HM70.

The HMD70Y has user selectable 0…1 V, 0…5 V or 0…10 V outputs corresponding to 0…100%RH and -20…+80 °C (-4…+176 ° F) temperature.
 

HMD60/70 Humidity and Temperature Transmitters
for Ducts in HVAC Applications


Vaisala HMD60/70 Humidity and Temperature Transmitters
Vaisala HUMICAP® Humidity and Temperature Transmitters HMD60 and HMD70 are designed for use in air conditioning applications where accurate and stable control of relative humidity and temperature are required.

 

Resistant to Chemicals and Dust


The duct mount HMD60 and HMD70 transmitters can also be used in many industrial humidity monitoring applications, where their stability and resistance to chemicals and dust are of great value. A useful feature of these duct mount transmitters is the ability to remove the electronics without removing the unit from the duct.

Fast, On-Site Calibration


The accuracy of the transmitters is simple to check using either the Vaisala HUMICAP® Hand-Held Humidity and Temperature Meter HM70 or the Vaisala HUMICAP® Humidity Indicator HMI41. The calibration can be done in seconds with a single potentiometer without disturbing the operation, resulting in great savings both in maintenance time and costs.

Humidity and Temperature Transmitter HMD70Y

MOUNTING
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Figure 1: Dimensions of the HMD70U/Y
The HMD70U/Y duct mounted humidity and temperature transmitters are three- wire transmitters. Mount the transmitter with two screws. Place the drilling template on the duct surface and drill the holes as indicated. Remember to drill an additional hole for calibration purposes. The calibration can be conveniently performed on site with the HMI41 or HM70 indicator equipped with an appropriate probe and optional calibration cable.

GROUNDING
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Figure 2: Signal cable grounding
Open the lid and mount the cable bushing set. If your transmitter has cable gland bushing (part no. 18941HM), do the grounding according to the Figure 2. When connecting the signal cable to the transmitter housing, fold the cable braid between the brass disk in order to achieve the best EMC performance. Do not leave the bare shield of the connected wires so that it can shortcircuit the electronics!

What's In The Box

  • Calibration certificate (ISO9001 compliant, traceable to NIST)
  • Cable gland for 7...10 mm (PG9) cable
  • User's Guide

Specifications

TECHNICAL DATA
  60 Series: 2-wire, 4 to 20 mA Output 70 Series: 3-wire, Variable Voltage Output
Model HMD60U HMD60Y HMD60T HMD70U HMD70Y HMD70T
Duct mount RH only RH & T T only RH only RH & T T only
Relative Humidity
Measurement range
                     duct mount                                     0 ... 100 %RH*
Accuracy at +20 °C

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Temperature dependence
 
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Response time at +20 °C (+68 °F), 90% response
15 s (with membrane filter)
Stability + 2 %RH / 2 years
Temperature (Y and T Models)
Linearity                                                          better than 0.1 °C
Sensor                                     Pt 1000 RTD Class F0.3 IEC 60751
Measurement range                      -20 ... +80 °C (-4 ... 176 °F) **
Accuracy
 
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** Optional temperature scales are available on request.
 
General - 60 Series
Linearity                                                          better than 0.1 °C
Sensor                                     Pt 1000 RTD Class F0.3 IEC 60751
Measurement range                      -20 ... +80 °C (-4 ... 176 °F) **
Accuracy
 
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** Optional temperature scales are available on request.
 
General - 60 Series
Supply voltage 10 ... 35 VDC (RL = 0 ohm)
20 ... 35 VDC (RL = 500 ohm)
Output signal 4 ... 20 mA
General - 70 Series
Supply voltage range depends on the selected output signal
  DC AC
0 ... 1V 10 ... 35 V 9 ... 24 V
0 ... 5 V 14 ... 35 V 12 ... 24 V
0 ... 10 V 19 ... 35 V 16 ... 24 V
WITH OPTIONAL CURRENT MODULE
0 ... 20 mA (RL = 0 ohm) 10 ... 35 V 11 ... 24 V
**0 ... 20 mA (RL = 500 ohm) 20 ... 35 V 17 ... 24 V
Power consumption @ 24 VAC
HMD70U 10 mA typical
HMD70Y 12 mA typical
General Specifications
Operating Temperature Range
Electronics -5 ... +55 °C (+23 ... +131 °F)
Probe -20 ... +80 °C (-4 ... +176 °F)
Storage Temperature Range -40 ... +80 °C (-40 ... +176 °F)
Maximum Flow Speed 50 m/s
Current Module part no. 18945 HM
Housing
Probe Stainless Steel
Electronics Cast Aluminum
Connections Screw Terminals 0.5 ... 1.5 mm2
Sensor Protection
Standard Membrane filter (part no. DRW010525)
Optional Stainless steel sintered filter (part no. HM46670SP)
Cable Thread-Through
Bushing for 7 ... 10 mm (PG9)
Bushing for NPT1/2” Cable Glands 242020
Cable Housing IP65 (NEMA 4) part no. 18941HM
Armoured Cable Glands part no. 10528HM
(must be ordered separately)
Complies with EMC standard EN61326 and EN55022
Dimensions
Dimensions in mm (inches)
                   VaisalaHMD60-70_imgspecs4_tn

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