November 2007Analytical Instrumentation & Environmental Monitoring
Danntech's new DIN rail mounting pH transmitter is a low cost alternative for applications where local display is not required. Any pH electrode can be used in combination with a variety of temperature compensation inputs.
Danntech’s low cost DIN rail mounting pH transmitter
Based upon 24 bit analogue to digital conversion, this transmitter provides excellent accuracy and galvanic isolation in a compact package.
The transmitters are configured using a PC and a configuration program to perform zero and span calibration as well as to set up the operation of the relay outputs and LEDs. The analogue output can be scaled to any range with filtering and inversion options. The two relay outputs can be configured as alarms with selectable operating sense and hysteresis or as control outputs.
A simple ASCII protocol is used to connect using RS485 so that multiple units can be connected to a control system.
It is possible to use the transmitter in a passive mode, where it operates like a remote terminal unit (RTU) with a 24 bit pH input, a 24 bit temperature input, a 12 bit analogue output, two relay outputs and two LED outputs each individually accessible and controllable.
The unit is 24 V d.c. powered and three way isolation up to 1000 V a.c. ensures trouble-free operation in process control environments where ground loops and noise may be prevalent.
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