Measurement of conductivity, % solution concentration, salinity and temperature
Wall mounting or head mounting versions
Detachable sensors on all variants for easy maintenance.
Up to two isolated 4-20mA current and two relay outputs.
Relays can be configured for on/off, time and pulse proportional control
Digital inputs for external range changing
Cable termination via detachable connectors, no need to open the enclosure
Low voltage operation 15-30v DC
Ideal for cooling tower bleed, rinse water and solution concentration applications
Preset curves stored for common chemicals and salinity
Custom curve from 2 to 9 points can be entered.
Two different options of the HET63 transmitter are available with the base model offering a single industry standard 4-20mA output while the Advanced HET63 offers two 4-20mA outputs enabling the process temperature to be measured and transmitted as well as the conductivity or solution concentration value.
The Advanced HET63 model also has three digital inputs for remote range changing via a plc. Both of the HET63 versions are available as head mounted transmitters mounted on an ECS64 Electrodeless conductivity sensor or as a wall-mounting version with a detachable cable and separate LTH ECS20 series or ECS40 series Electrodeless conductivity sensor. The HET63 is able to display the measured value in conductivity in S/cm or mS/cm or % solution concentration as well as displaying the process temperature in C or F. The 2 off independent relay outputs can be allocated to either process or temperature measurement, with on/off control, variable hysteresis and time delays along with time and pulse proportional relay operation all configurable from the user menu. Relays can be programmed to energise on a variety of different functions including errors, instrument status, e.g. off-line/calibration mode, or if a dose alarm time has been exceeded. All cable connections to the HET63 are by detachable connectors with no need to open the HET63 enclosure.
The HET63 has been designed with two levels of programming to cater for both novice and experienced instrument operators. On-line HELP facilities consist of a series of text error messages which are displayed when programming is incorrect, or if a sensor is not reading a sensible value for the instrument set-up. A further enhancement is multi-level security, where day to day operator access can be limited to viewing data and settings only, while allowing full access to the instrument programmer. Configuration data can be saved in one of two independent back-up locations, which can be used for fast reconfiguration, emergency restoration of settings, recovery after tampering by unauthorised operators, etc. Multilingual text displays can be selected with a choice of English, French, Spanish and Italian. As an alternative to showing a digital displayed value the HET63 can display the current outputs as a bar graph. It is possible to display current output A, current output B, either current outputs or alternating in the bar graph mode. The mode of display can be changed under the configuration menu. Both measurement inputs and current output(s) can be individually calibrated from the front panel. For applications requiring accurate measurements it is possible to optimise the instrument reading to either a standard solution or a titrated solution concentration.
An off-line facility allows the instrument to be adjusted without disturbing external processes by de-energising the set point relays and holding the current output(s) at the last on–line value. The HET63 also has a simulate mode enabling the user to test the operation of the set point and current outputs. Automatic temperature is available as standard on all models. For applications where temperature compensation is not required it can be switched out.
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