All STs Series base prices include a 25 ft cable.
The STs Series Dissolved Oxygen combines a dissolved oxygen and temperature sensor along with a 4-20 mA transmitter into one durable, compact device. The dissolved oxygen electrode is galvanic with a large surface area anode and a Teflon membrane, providing fast response times and low energy usage. The large electrode tip provides the STs Series Dissolved Oxygen with a longer lifetime than typical sensors, averaging about two years.
The STs Series measures 0-20 mg/L (ppm) with an included temperature sensor measuring 0-50°C. Automatic Temperature Compensation is provided independently of the temperature output from 0-70°C.
Isolation and differential amplification eliminate background noise and ground loops, allowing for use in a wide range of water quality monitoring and process control applications.
All parts, including the cable, are easily replaceable.
Features and Benefits
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.
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 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.