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JH240
2-WIRE RTD TRANSMITTER
FEATURES
* * * * * * * For 100 ohm Platinum RTDs - Linearized Three-Wire Lead Resistance Compensation Low-Drift Input Amplifier Fits Standard Connection Heads -40 to +80 Degree C Operation Quick-Check Output LED DIN Rail Mounting Available
DESCRIPTION
The Model JH240 2-wire transmitter provides a 4/20mA current loop output proportional to temperature as measured by a 100 ohm platinum RTD (resistance thermometer). A fixed-range device, it is precisely calibrated to your specified input range at the factory. (For a rangeable 2-wire RTD transmitter see Model JH245.) RTD linearization is provided. Three-wire input circuitry eliminates errors due to lead wire resistance. Conformal coating protects the circuitry against condensation and corrosion in industrial atmospheres. The JH240 is a loop-powered device. Connected in series between a 24Vdc supply and readout instruments, it receives its power from the 4/20mA output loop. A built-in LED indicates loop current: dim at 4mA, bright at 20. The JH240 does not provide input/output isolation. Its small 1-3/4 inch diameter allows the transmitter to fit most standard thermocouple-type connection heads. It also may be surface mounted. A DIN rail mounting clip option is available.
HOW TO ORDER
Model Number: JH240. Input Range: Specify any range allowed by the "Input Capabilities" spec (see back). RTD Type and Curve: 100 ohm platinum RTD only. Standard DIN/IEC calibration is normally used. If a different platinum RTD curve is needed, please specify on your order. Output Range: (Always 4/20mAdc.) Power: (Always dc loop powered.) DIN-Rail Mounting: Change model number to Model JH240-DIN. (See "Installation and Connections," below.) Note: Urethane coating is standard.
OEM PRODUCTS
JH Technology 2-wire thermocouple and RTD transmitters can be made available with solderjumper pads for range selection. Contact the factory for details.
INSTALLATION
The 1-3/4 inch diameter JH240 is designed to fit many standard thermocouple-type connection heads. It may also be mounted to any surface using two #8 (or smaller) screws. An optional DIN-rail mounting clip (specify Model JH240-DIN) allows the transmitter to be snapped onto DIN rail. Width is 1-3/4 inches.
RTD Type: 100 ohm platinum RTD. Factory calibration is per DIN/IEC standard unless otherwise specified. Output: 4/20mA, 2-wire (loop-powered) output. Accuracy: +/-0.1% of span or 0.05 deg C (0.09 deg F), whichever is greater. Adjustability: Zero and span each are adjustable approx. +/-15% of span. Response Time: Under 100 milliseconds. Operating Temperature: -40 to +80 deg. C (-40 to +176 deg. F). Temperature Stability: +/-(0.02% of span plus 0.005 deg C) per deg. C, or better. Power Requirements: DC loop-powered. Requires at least 12Vdc at the transmitter's output terminals. 36Vdc maximum.
CONNECTIONS
Connections are made to the transmitter's terminal strip. Connections are: "+" Terminal: Output/Power Loop. Receives current from (+) DC supply. "-" Terminal: Output/Power Loop. Passes on current to the next series loop device, or to the (-) supply. Terminal A: RTD (opposite end from Terminal C). Terminal B: RTD compensation (same end of RTD as Terminal C). When connecting to 2-wire RTD, jumper terminals B and C. Terminal C: RTD.
SPECIFICATIONS
Input Capabilities: Minimum span 10 deg. C (18 deg. F). Maximum range includes the RTD's full temperature range. Low end of range may be zero degrees, elevated or suppressed.
SARASOTA, FL USA (800) 808-0300 www.jhtechnology.com e-mail: jhtek@jhtechnology.com

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