The BpHT229 has been designed for input of the standard combined reference glass electrode, via a BNC socket mounted onto the module front. Remote measurement points no longer require expensive cabling as the transmitter can be mounted close to the process with a low cost 4 – 20mA signal cable transferring the pH signal to control rooms and other locations. Standard output is 4 – 20mA with a minimum supply voltage of 8V. This enables the pHT229 to be used in 12V battery supply systems. Other factory set output configurations are 10 – 50mA loop powered and 0 – 10mA, 0 – 20mA or voltage output in 3-wire connection. The input from the electrode is fully isolated to output to prevent earth loop problems associated with earthed tank systems. Double surge protection is standard with all Series 200 loop powered transmitters to prevent failure due to spikes induced by DC switched inductive loads. The BpHT229 features a high impedance input provides signal reversing (pH), buffering and scaling to cover almost any application. Final non-interacting ZERO and SPAN adjustments are accessible from the front of the module. A front mounted L.E.D. and a test socket verify module function and assist in calibration checks without disconnection of output wires.