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pH Transmitter
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Submersible pH Transmitter STs1010
The STs series of submersible water quality transmitters have an integrated preamp and an isolated 'true 2-wire', 4-20 ma transmitter. Two independent channels can simultaneously transmit a pH and temperature signal -- two wires for pH and two wires for temperature. The compact design afforded by the patented pHiKEC keyless connection system -- and the 316SS and PVDF construction -- make the rugged sensor/transmitter ideal for applications such as process control, data acquisition, wastewater treatment, and, groundwater monitoring.
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Product Description
description
The STs series of submersible water quality transmitters have an integrated preamp and an isolated 'true 2-wire', 4-20 ma transmitter. Two independent channels can simultaneously transmit a pH and temperature signal -- two wires for pH and two wires for temperature. The compact design afforded by the patented pHiKEC keyless connection system -- and the 316SS and PVDF construction -- make the rugged sensor/transmitter ideal for applications such as process control, data acquisition, wastewater treatment, and, groundwater monitoring, The units can be submersed to 200 feet (approximately 100 psi). Individual units can be combined to make redundant or multiparameter modules using the pHionics' patent pending pHiKLIP array system. The pHiKLIP system also allows for the units to be used in in-line (insertion) applications without fear of blow-out. As with all pHionics' designs, the sensor/transmitters are designed with 'ease of service' as a primary goal.
operation
The 'true 2-wire', 4-20 ma STs series sensor/transmitters send a current proportional to the paramater being measured on the same two wires that provide the power (7 to 40 volts dc). Current transmission allows for long runs of inexpensive cable or wire (up to three miles) that is virtually noise-free without any signal loss that is common to voltage (IR drop) or digital (capacitance affecting 'rise/fall' timing). The seven volt operation allows the units to be powered by 12 volt battery systems with 5 volts of compliance, making them compatible with RTU's and solar powered applications. The units are intended for calibration via software supplied with the datalogger, PLC, or through the DCS. The pH signal on channel 1 is automatically temperature compensated -- providing a Nernstian correction to yield the true pH output regardless of temperature changes. This is not to be confused with the temperature option (STs1010 ), which provides an independent, isolated, 4-20 ma output proportional to the 0 to 50 C range on channel 2. The auto-polarity correction feature directs the applied supply voltage to allow for proper operation regardless of wire hookup. Red and Black are for channel 1 -- pH, and Orange and Brown are for the optional channel 2 -- temperature.