Microline Transmitters

Features

	Attractive and rugged packaging.
	2%, 3% or 5% RH accuracy.
	1% accuracy available.
	Easy to install.
	Easy to field-calibrate.
	User-selectable outputs.
	10-point factory calibration.
	Proven, reliable sensor technology.
	Versatile temperature measurement.
	Temperature-compensated.
	Economical.
	Two-year warranty.

Applications

	HVAC/Building Controls
	Energy Management Systems (EMS)
	Enthalpy Control
	Indoor Air Quality (IAQ)
	Clean Rooms
	Museums/Archives
	Hospitals/Labs
	Refrigeration Control
	Pharmaceutical
	Swimming Pools
	Animal Rooms

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MicroLine RH & Temperature Transmitter

Microline™ Transmitters possess superior versatility, reliability, and performance. You may choose space, duct, or outside air models with thermistor, RTD, or signal-conditioned temperature outputs. All models get a 10-point factory calibration against a National Institute of Standards and Technology (NIST) traceable standard, the highest quality calibration standard available. Competitors use one- or three-point calibrations. Prewired base and plug-in electronics in the cover make installation quick and easy. Field-selectable outputs give you greater convenience and versatility and reduce your investment in transmitter inventory. Accuracy choices are 2%, 3%, or 5% at 20 to 95% RH. 1% accuracy is also available. Typical drift is less than 1% per year and all models can be field-calibrated to eliminate expensive downtime. Each Microline™ model comes with GEI's proven bulk polymer RH sensor for maximum reliability and a two year warranty.

Easy to Install

Space and duct mounts have a pre-wired base; sensor and transmitter electronics are housed in the cover. Wiring is connected to the terminal block in the base and the cover can be snapped into place at a later time. This feature is especially attractive when a transmitter will be incorporated into new construction because it lets the user mount and wire the unit without the sensor and electronics, thereby avoiding possible damage from rough handling or contamination from paint and dust.

The EasyCal-Plus Handheld Calibrator/Portable RH Indicator makes it easy to perform quick, on-site one-point offset adjustment of the transmitter without interrupting operation. No tools or disassembly are required – just plug the EasyCal into the phone jack connector. The EasyCal displays values for both the transmitter and the environment, eliminating the need for additional reference devices. A user can check the transmitter while operating and, if necessary, perform a one-point offset adjustment in about 60 seconds.

User-Selectable Outputs

The sensor output signal is field-selectable from 0-5 or 0-10 volt to 4-20mA current in the RH-only version. The temperature output transmitter is available in voltage or current outputs.

10-Point Factory Calibration

General Eastern automatically tests and calibrates each Microline™ transmitter at 10 different points against a NIST-traceable standard. Calibration data is available on 2% accuracy RH units. Compare this with competitive models that are calibrated at three points - or less. This 10-point calibration ensures that you get maximum accuracy from your transmitters - right out of the box and into the future.

Proven Reliable Sensor Technology

Each Microline™ features a bulk polymer resistive sensor. This sensor has been field-proven in hundreds of applications for more than a decade. As a result, you can expect long-term stability with minimal drift. Because the sensor is a bulk resistive device, it will not be affected by surface contamination in dirty environments.

Versatile Temperature Measurement

The Microline™ offers you a variety of temperature measurement options. Choose from a thermistor of RTD direct measurement or an RTD with signal conditioned voltage or current output.

SPECIFICATIONS

Humidity:

Sensing Element: Resistance change of bulk polymer
Accuracy at 25ºC(77º F): +/- 2%, 3% or 5% RH at 20 to 95% RH, includes hysteresis, linearity and repeatability
Operating Range: 0% to 99% RH (noncondensing), -29ºC to +60ºC (-20º to +140º)
Long term stability: Less than 1% drift per year typical
Temp. effect: Less than 0.11% per ºC(0.06% per ºC)
Sensitivity: 0.1% RH
Repeatability: 0.5% RH
Linearity: See accuracy
Hysteresis: Less than 1% RH
Signal Outputs: 4 to 20mA, 0 to 5 volts, 0 to 10 volts, (0 to 100% RH linear)
Supply voltage: 18 to 36 VDC
Maximum load (Current Output Only): ohm = Supply –10VDC/.02 Amps
Storage temperature: -65ºC to +70ºC (-85º to+158ºF)

Easycal-Plus RH Calibrator/Indicator

Sensing Element: Resistance change of bulk polymer
Single point calibration range:20% to90% RH
Single point calibration accuracy: +/- 2% RH
Reference probe accuracy: +/- 2% RH(20% to 90% RH)
Long term stability: Less than 1% drift per year typical
Temperature effect: Less than 0.11% per ºC (0.06% per ºF)
Probe dimensions: Diameter: 0.5 inches
Length: 3 inches
Power supply: 9VDC alkaline battery, continuous use for 40 hrs., Auto power-off

Temperature - Thermistor (Direct Connection)

Sensing Element: 10K thermistor at 25ºC (77ºF)
Accuracy at 25ºC (77ºF): +/- 1.2ºC(+/- 2.0ºF)
Signal Output: Direct Connection

Temperature - RTD (Direct Connection)

Sensing element: Thin film platinum RTD 1000 ohm (.00385 alpha)
Accuracy at 25ºC (77ºF): +/- 0.3ºC (+/- 0.5ºF)
Signal Output: Direct Connection

Temperature - RTD SIGNAL CONDITIONING

Sensing element: Thin film platinum RTD 1000 ohm (.00385 alpha) with signal conditioning
Accuracy at 25ºC (77ºF): +/- 0.3ºC (+/- 0.5ºF)
Operating Range: 0% to 99% RH (noncondensing), -29º to +60ºC(-20º to+140ºF)
Long term stability: Less than 0.2ºF per year
Temperature Effect: Less than 0.02% per ºC (0.01% per ºF)
Sensitivity: 0.1%
Repeatability: Better than 0.1%
Linearity: Less than 0.01%
Sensor Interchangability: +/- 0.3º C(+/- 0.5 ºF)
Signal Outputs: 4 to 20 mA, 0 to 5 volts, 0 to 10 volts, (-20º to 140º linear)
Supply voltage: 12 to 36 VDC
Storage Temperature: -65º to 70ºC(-85º to 158ºF)

Demanding Environment Applications

For challenging applications such as swimming pools, hospitals, labs and animal rooms, the Microline Transmitter is available with a new bulk polymer resistance sensor that has exceptional chemical resistance, especially to ammonia and chlorine. Consult factory.

ORDERING INFORMATION
Model		Accuracy		Outputs (T1, T2 & T3 only)		Mounting		Temperature Ranges
MRH -	RH only*	2 -	2%	I -	4-20 mA	S -	Space	1 -	-20° to +140°F
MRHT1 -	RH & 10Kohm Thermistor	3 -	3%	V -	0-5 or 0-10 Volt (User Selectable)	D -	Duct	2 -	0° to +150°F
MRHT2 -	RH & 1000 ohm RTD	5 -	5%			OA -	Outside Air	3 -	0° to +100°F
MRHT3 -	RH & 1000 ohm RTD with Signal Conditioning							4 -	-32° to +132°F
	RH & 1000 ohm RTD with Signal Conditioning							5 -	-50° to +130°F
								6 -	-40° to +140°F
								7 -	Custom Range
								8 -	-32° to +122°F
EASYCAL PLUS		Battery Powered Handheld Calibrator and Portable RH Indicator
*RH only version is field-selectable between current and voltage output. All voltage transmitters are shipped in 0-10 volt output. Jumper used to switch to 0-5 volt output. 1% RH accuracy available. Counsult factory.