Thermocouple & RTD Temperature 4-20 mA Current Transmitter

Description

Laureate™ 4-20 mA transmitters with the temperature signal conditioner board provide a linearized, highly accurate, stable and repeatable transmitter output for multiple thermocouple types and 100 Ohm platinum RTDs. The meter accepts the outputs of types J, K, T, E, N, R and S thermocouples, plus 100 ohm platinum RTD’s with DIN alpha of 0.00385 and ANSI alpha of 0.003925. The thermocouple or RTD and temperature range, specified in °C or °F, are user-selectable. The temperature range can be as wide as the entire span of the thermocouple or RTD type, or as narrow as 150 counts (such as 15.0°), limited only by considerations of electrical noise and digital filtering time constants.

Cold junction compensation automatically corrects for temperature variations at the thermocouple reference junction at the transmitters. Open sensor indication is standard and may be set up to indicate either upscale or downscale. RTD excitation is provided by the transmitter. RTD connections can be of the 2-, 3- or 4-wire type. For 3- and 4-wire connections, the transmitter automatically compensates for lead resistance of the sensor.

All ranges for all temperature sensor types are digitally calibrated at the factory. This eliminates the need for field calibration or drift caused by potentiometers found in non-microcomputer based devices.

All Laureate analog input meters and transmitters allow exceptionally fast read rates. Concurrent Slope (Pat 5,262,780) is a method of analog-to-digital conversion that allows up to 60 conversions per second while integrating the input over a full power cycle. Fast read rates provide true readings and fast response for PID control applications and for peak capture.

The transmitters are housed in a DIN rail case that is only 22.5 mm (0.89") thick. Signal connections are via detachable screw-clamp plugs.

In addition to the 4-20 mA output that would typically be used for signal transmission in an industrial environment, a 0-10V analog output is selectable. Either selection provides 12-bit (0.025%) resolution of output span and is ultra-linear, with the analog output tracking the reading that would be transmitted digitally.

Transmitter programming is via a three-terminal RS-232 port using Laurel's PC-based Instrument Setup Software. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Laurel (P/N CBL03).

 Specifications- Laureate 4-20 mA Transmitters, Thermocouple or RTD Input
(Click on links in previous section for details by signal type)

Thermocouple Input