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Humidity Instruments


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page21

Wide Range Duct Humidity Transmitter

(5)
  • Now measures 5 to 98% rH
  • Temperature compensated
  • Computer certified
  • 2-Wire, 4...20mA
  • Economical pricing
  • Accuracy +/- 2% or better at 25 degrees C

    Our microprocessor based, temperature compensated humidity transmitter has been designed to meet the demands of energy management, environmental and process industries. The polymer based humidity sensor is one of the most stable sensors available. The 2 wire, 4-20 mA design provides ease of installation, lowering the cost of field wiring.
    The high accuracy over the wide range of 5-98% rH allows precise measurement of the humidity over the operating range of 0 to +60ºC. Even condensation on the sensor will not harm it.
    Each transmitter is ...
  • page22

    Wide Range Space Humidity Transmitter

    (5)
  • Measures 5 to 98% rH
  • Temperature compensated
  • Computer certified
  • 2-Wire, 4...20mA
  • Accuracy +/-1, 2 or 3%rH at 25 degrees C


  • Our microprocessor based, temperature compensated humidity transmitter has been designed to meet the demands of energy management, environmental and process industries. The polymer based humidity sensor is one of the most stable sensors available . The 2 wire, 4-20 mA design provides ease of installation, lowering the cost of field wiring.
    The high accuracy over the wide range of 5-98% rH allows precise measurement of the humidity over the operating range of 0 to +60ºC. Even condensation on the sensor will not harm it.
    Each transmitter is ...
    page23

    Economy 3% Duct Humidity Transmitter


  • Temperature compensated
  • 2-Wire, 4...20mA
  • Economical pricing
  • 3% accuracy
  • Measures 10 to 90% rH


  • Our temperature compensated humidity transmitter has been designed to meet the demands of energy management, environmental and process industries. The polymer based humidity sensor is one of the most stable sensors available. The 2 wire, 4-20 mA design provides ease of installation, lowering the cost of field wiring.
    The high accuracy over the wide range of 10-90% rH allows precise measurement of the humidity over the operating range of 0 to +60ºC. Even condensation on the sensor will not harm it.
    Each transmitter is calibrated in our computer operated atmospheric ...
    page24

    Economy 3% Space Humidity Transmitter


  • Temperature compensated
  • 2-Wire, 4...20mA
  • Economical pricing
  • 3% accuracy
  • Measures 10 to 90% rH


  • Our temperature compensated humidity transmitter has been designed to meet the demands of energy management, environmental and process industries. The polymer based humidity sensor is one of the most stable sensors available. The 2 wire, 4-20 mA design provides ease of installation, lowering the cost of field wiring.
    The high accuracy over the wide range of 10-90% rH allows precise measurement of the humidity over the operating range of 0 to +60ºC. Even condensation on the sensor will not harm it.
    Each transmitter is calibrated in our computer operated atmospheric ...
    pg20

    High Temperature Humidity Transmitter

    (4)
  • Temperatures up to 140ºC
  • Remote Probe Option
  • Stainless Steel Construction
  • 2-Wire, 4...20mA


  • Our high temperature humidity transmitter has been designed to meet the demands of wood drying, pallet sanitizing and other heat treating and drying applications requiring humidity measurements in atmospheres above 100C. The polymer based humidity sensor is one of the most stable sensors available. The 2 wire, 4-20 mA design provides ease of installation, lowering the cost of field wiring.
    The high accuracy over the wide range of 5-98% rH allows precise measurement of the humidity over the operating range of 0 to +140ºC.
    Each transmitter is calibrated in our computer operated ...
    page25a

    Aspirated Humidity Transmitter

    (5)
  • Now measures 5 to 98% rH
  • Temperature compensated
  • Computer certified
  • 2-Wire, 4...20mA
  • Economical pricing


  • Our microprocessor based, temperature compensated humidity transmitter has been designed to meet the demands of greenhouse operators, energy management, environmental and process industries. The polymer based humidity sensor is one of the most stable sensors available . The 2 wire, 4-20 mA design provides ease of installation, lowering the cost of field wiring.
    The 2% accuracy over the wide range of 5 to 98% rH allows precise measurement of the humidity over the operating range of 0 to +60ºC. Even condensation on the sensor will not harm it.
    Each transmitter is ...
    page26

    Wet/Dry Bulb Psychrometer


  • Aspirated with built-in fan
  • 2% accuracy
  • Reflects solar radiation
  • Corrosion resistant

    Our wet and dry bulb psychrometer has been designed for mushroom and greenhouse applications. Wet and dry bulb humidity measurements taken with this instrument are extremely accurate because we use matched pairs of sensors and provide forced ventilation across the wet bulb using a miniature fan.
    This psychrometer functions throughout the complete humidity range including the area between 90 and 100%rH where mushroom growers especially need precise control.
    The outside of the unit is white to reflect solar radiation and the sensors are mounted inside the instrument so that sunshine cannot reach them.
    The large ...
  • page27a

    Precision Wet/Dry Bulb rH Transducer


  • High Accuracy
  • Wide temperature range.
  • 4-20 mA sourcing output
  • Small size and easy installation
  • Low cost


  • The HT-WD-420 transmitter is a microprocessor based device that uses the signal from two 3-wire RTD sensors (wet bulb and dry bulb) to calculate the relative humidity value. The microprocessor utilizes a scientific rH calculation algorithm that produces very accurate data over a wide temperature range. (This algorithm is a refined version of ASHRAE equations used originally for the creation of Psychrometric Charts)
    The board may be programmed for various above sea level values to allow rH compensation in the wet/dry method. The output is linear in its entire range from 0 ...
    page28

    Outdoor Humidity Transmitters - Hygrometers

    (4)
  • Operates from -60 to +70ºC
  • Two percent accuracy
  • Long Term Reliability


  • These humidity transmitters are the type used on unattended remote weather stations across Canada. Even in arctic conditions they perform accurately and without problem. In energy management projects with hundreds of points it is normal to have only one outdoor humidity sensor. If that sensor is not accurate then energy costs may rise and building comfort may suffer. The trouble free, accurate, service year after year of these transmitters can quickly justify their higher cost.

    Specially prepared human hair is used as a sensor. These hairs are specially treated to make them react quickly to changes in humidity. ...
    page29

    Temperature/Humidity recorder - Thermohygrographs

    (2)
  • 1% temperature 2 or 3% rH
  • 1/7/31 day switchable
  • Self Contained
  • Traceable certification available


  • Use our thermohygrographs whenever you need a record of humidity and temperature conditions. Just put them in place and start recording, no connections, not even a power cord. That's faster, easier and likely less expensive than electronic instrumentation and data loggers.
    Because we can supply them with traceable humidity and temperature certification and these recorders are easily transported to our Toronto plant for re-certification they may be ideal to meet your QA requirements. Applications include laboratories, clean rooms, museums, libraries, warehouses, environmental chambers ...
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