The pHionics STs Series™ pH sensor/transmitter provides highly accurate pH measurement from 0-14 pH. The electrode is glass with a silver/silver chloride reference wire and double junctions to ensure long-term stability in harsh chemical solutions.
In addition, the body is made from Delrin and 316 Stainless Steel which provide excellent chemical resistance and durability for many years of service. Finally, input/output isolation, combined with differential amplification, virtually eliminates any forms of interference. From monitoring groundwater pH for contamination to industrial process control, the STs Series pH sensor/transmitter provides high value for long-term water quality applications.
Noise Reduction
From crystal-clear streams only touched by radio frequencies to wastewater treatment plants surrounded by heavy machinery, background noise and interference is everywhere. Our signal conditioning removes background (common-mode) noise from the measurement to ensure high accuracy. The signal is also sent through a preamplifier to strengthen it before traveling through a twisted-pair, shielded cable that protects the amplified 4-20 mA signal until it reaches the datalogger or controller.
Ease-Of-Use
Typical 2-wire transmitters are relatively easy to set up but improper wiring can result in damage to the transmitter or expensive controller. The STs Series prevents damage with a reversible input protection so the two wires per parameter can be switched without performance issues. Additionally, all parts, cable included, are quick and easy to replace without any special tools. This cuts down on maintenance time and costs, especially in circumstances where cable damage otherwise requires complete replacement of traditional sensors and transmitters.
Isolation
Isolation removes ground loop interference to save troubleshooting time and money by preventing damage to connected electronics in the case of power surges up to 600V. This allows the STs Series to be used in process control applications without worrying about different grounding potentials of the solution or mounting surface. It has the added benefit of protecting connected devices and people if exposed to large amounts of current caused by damaged machinery or improper wiring.
Low Power Usage
Sensors and transmitters made by other competitors commonly use more current than the 4-20 mA signal to power their devices, ranging from 3-15 mA additional. pHionics only ever uses the amount of current required for the signal, allowing STs Series devices to function between 60% to 375% longer on the same battery. The STs Series also only requires 8 VDC and has a three second turn-on time, further reducing power usage.