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ETTR-Programmable Temperature Relay

Features:

  • Inexpensive, microprocessor based design

  • User programmable using GUI software

  • Relay output, SPDT 1A contact

  • Programmable hysteresis and minimum cycle timing

  • Programmable LOCKOUT to prevent cycling after a certain temperature has been reached.

  • Stand alone operation with remote monitoring option

  • Set includes 10 k thermistor, mounting track and programming software

NEW!! - The ETTR now supports ANY 10 k Thermistor!!!!

Application:

The ETTR may be used as a simple temperature controller, providing on/off relay output for fans, heaters, shut off valves and safety systems. Because of its software adjustable parameters, the product is highly customizable - an ideal solution for many OEM temperature control applications. 

Product Description:

The ETTR is a programmable temperature relay with the ability to act as an ON/OFF temperature controller. The device is capable of fully stand alone operation, but may be monitored and programmed with the custom software and a serial RS232 interface. 

The unit may be programmed to work in various modes:

  1. Range (ON/OFF)- will turn the relay on/off between two defined temperature values

  2. Setpoint (Heating/Cooling) - will turn the relay (off/on) above a set value, and (on/off) above a second set value

  3. Manual - Allows manual (via PC) control of the output relay

The span between the temperatures in Setpoint mode may be used to adjust the hysteresis of the device.  An adjustable short cycle timer may be configured to prevent rapid cycling of the relay.

A lockout feature is implemented to maintain the output relay status after it switches.  This may be used in an alarm condition to alert the operator that an over/under temperature situation occurred.  Power cycling the device resets it.  

The GUI allows monitoring of the temperature, and provides information on the status of the device (including communication timeouts and Thermistor wiring errors).  The GUI also allows logging of temperature data to an ASCII text file in a semi-colon delimited format which may later be imported to a spreadsheet application such as Excel.

NEW!!: The ETTR is now compatible with ANY 10 k ohm thermistor.  Software version 2.2 and up now supports inputting of custom R/T curve for use with other thermistors.  Up to 100 R/T points may be entered, and the software will use linear interpolation between points to calculate accurate temperatures!

Specifications:

Power: 12 to 24 VDC (100mA minimum) or 18 to 24 VAC 
Input: Single NTC 10 k thermistor in brass tubing (provided),

NEW!! - Customer provided 10 k thermistor may be used with new software version by inputting the R/T curve for the given thermistor.

(Min Resistance = ~650 ohms)
(Max Resistance = ~130k ohms)
Output: Form C output relay (rated 1A @ 24 VAC/VDC) (low voltage)
Indication: Status - Green LED 
   - solid = Power ON 
   - flashing = Thermistor wiring fault
Temperature Range: -25°C to 100°C (-13°F to 212°F)
Computer Interface: Serial communications via RS232 port, Windows® based software provided.  Communications protocol available upon request.  Please contact Elkor Technologies Inc. for more information.
Dimensions: 1" x 2.25 “ (26 x 57 mm), board mounts in TR-1 plastic snap-track (provided)

Screenshot:


Information:


ETTR Control and Monitor Software		 Download ETTR Software v2.5 (536kb)
AN0301 -
ETTR Serial Communications Protocol		 PDF

Datasheet		 PDF

Wiring Diagram		 PDF

copyright (c) Elkor Technologies Inc.