Humidity, Dew Point and Temperature Meters

“Tomorrow’s Instruments Today” — “For Good Measure” ^®

A Leading South African Test and Measurement Instruments Supplier

“For Good Measure”^®

TMI, Established—1982

Test and Measurement Instruments C.C.

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T + M®

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Ph: +27 (011) 683 4365

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37 Garden St,

Cnr 160 Bellavista Rd,

Turfclub, Johannesburg, 2135

SOUTH AFRICA

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P.O. Box 1416,

Southdale,

Johannesburg, 2135,

SOUTH AFRICA

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Humidity / Temperature Meters

Humidity Meters

Part No: HT-3006HA

Combo Humidity / Temperature & TypeK/J Thermometer, 10%-95%RH, 0-50 degC, -199 to 1300 degC, Min-Max, Data-Hold, Super Large LCD Display

Part No: HT-3009

Dew Point & Data Logger, 0-100 %RH, 0.01% Res Manual & Auto Data Logger with 1000 reading recall, Auto Power Off, RS232

Lutron

Part No: YK-90HT

Combo Humidity, Temp, Dew Point, Intelligent, Fast, Data Logger with 1000 readings, Manual & Auto, Microprocessor, Max-Min, RS232

Lutron

Part No: LM-8000

Combo 4 in 1 Anemometer / Humidity meter / Light Meter & Thermometer with Data-hold, Min/Max record Fast response

Part No: LM-8010

Combo 4 in 1 Anemometer CMM & CFM/ Humidity meter / Light Meter & Thermometer with Data-hold, Min/Max record, Fast response

Lutron

Part No: YK-2005RH

Combo Dew Point, Humidity, Temp, Tupe K/J, Real Time Data Logger, 16 000 Point, Record Max-Min, Zero Adjust, RS232

Lutron

T + M^®

Part No: PHB-318

Combo Humidity: 10% -95% RH, Barometer : 10 - 1100hPa, Temperature Meter: 0 - 50degC.

Lutron

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Notes on Humidity meters.

Humidity measurement instruments and transducers test for absolute humidity, relative humidity, or dew point in air. The range humidity measurement instruments operate in is typically from 0 to 100% humidity. They are sometimes combined with other sensing devices such as temperature sensors.

Humidity measurement instruments and sensors can sense a number of different factors. Absolute humidity, expressed as grams of water vapor per cubic meter volume of air, is a measure of the actual amount of water vapor or moisture in the air, regardless of the air's temperature. Relative humidity (RH), expressed as a percent, also measures water vapor, but relative to the temperature of the air. The dew point temperature, which provides a measure of the actual amount of water vapor in the air, is the temperature to which the air must be cooled in order for that air to be saturated and dew to form. Because of the intertwining of atmospheric measurements, humidity measurement instruments are sometimes equipped with pressure and temperature sensors as well. Three main applications for humidity measurement instruments are judging moisture in gases or air, bulk solids or powders, or else if fuels or other liquids.

There are many technologies for humidity measurement instruments. Capacitive or dielectric instruments have a material that absorbs moisture, which changes its dielectric properties and enhances its capacitance. Chilled mirror technology uses a mirror that is chilled to the point that moisture starts to condense on it. This temperature is the dew point. With electrolytic technology, moisture is proportional to the current needed to electrolyze it from a desiccant. For resistivity or impedance style sensors, a material absorbs moisture, which changes its resistivity or impedance. In strain gage instruments, a material absorbs water, expands and is measured with a strain gage. Psychrometers, often called wet/dry bulbs, measure relative humidity by gauging the temperature difference between two thermometers, one wet and one dry.

One critical specification for these devices is the humidity or moisture range to be measured or else the dew point range. Humidity and moisture accuracy is expressed in terms of percentage of measurement. The dew point accuracy, since this is a temperature reading, is expressed as a variance in temperature output.

Outputs from humidity measurement instruments can be analog current, voltage, or frequency; digital, including computer signals; or a switch or alarm. They can have analog, digital or video type displays and can have a number of different form factors. They can be PCB-mount devices, standard sensors or transducers, or a simple gauge or indicator. They can also be various types of instruments, whether handheld, benchtop or mounted.

In addition to pressure and temperature compensation, humidity measurement instruments can have a number of features to make them more useful or easier to use. These can include data logging, event triggering, self-testing, self-calibration, and battery power.

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Humidity meters, Humidity Data loggers and Humidity / Dew Point combination meters to measure other parameters such as Light , Temperature and Pressure.

Part No: HD-3008

Intelligent Humidity / Dew Point Meter, Thermometer. Uses High Precision Capacitor Thin-film sensor, not dependent on air flow. Temp Compensation.

Lutron

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Accessories

Part No: SW-DL2005

Optional Data Logging Software, for HT-3009, HT-315, HT_306, HT-3015, YK-90T … downloads data from Instrument to PC for analysis in EXCEL.

Lutron

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Adapters

Part No: HA-702

Humidity Adapter. 10 to 95% RH, 1 mV DC per 1% RH. Resolution: 0,1 % RH. Output : 0– 100mV DC. Separate Probe. To be used with Multimeter or datalogger.