pHionics STs Series® ORP Sensor

3rd party Sensor, RX station-compatible

$980.00 USD

Durable water quality sensor that can be combined with HOBO RX systems to provide real-time redox potential (EH).

Important Information

25-foot cable included. Manufactured and distributed by a third party, pHionics, this sensor can deliver real-time data to the LI-COR Cloud remote monitoring platform when connected to a cellular HOBO RX station via the Analog Module or with a HOBOnet wireless sensor network's Analog Mote.

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Overview

The pHionics STs Series™ ORP sensor (sonde) provides reliable ORP and measurements to monitor bacterial activity, sanitization, or heavy metal pollution. This sensor may be connected to an RX station using an an Analog Mote and HOBOnet Manager (wireless) or an Analog Module (wired).

Accurate and low-maintenance operation is ensured with noise-resistant 4-20 mA analog signals and a large-volume, double-junction electrode. Typical electrode life is 2-4 years and, when needed, a replacement is easily installed thanks to pHionics’ patented pHiConn™ Connector System. In addition, the electronics are isolated to prevent ground loops and proprietary signal conditioning virtually eliminates background noise.

Durability is guaranteed with chemical-resistant 316 Stainless Steel (titanium optional) and high-quality double O-ring seals that last many years, even in harsh conditions. When combined with the compact design (0.75 in. or 19 mm diameter), this ORP sensor proves to be compatible with a wide range of applications including aquaculture, environmental monitoring, and pollution control.

If you need a sensor that works anytime, anywhere, for many years, then the pHionics STs Series ORP sensor is here for you.

Features

Combination double-junction electrode with large, gel-filled reference
Secondary 0-50°C temperature sensor 
4-20 mA signal capable of transmission up to 3 miles (with proper wire gauge) 
Built-in electrical isolation to prevent ground loops
Chemical-resistant PVDF and 316 Stainless Steel housing (Titanium optional) 
Narrow diameter (0.75 inches or 1.9 cm) 
Removable electrode guard to reduce debris or algae buildup and protect from damage 
Fully submersible up to 70 psi 
Shielded, Kevlar®-reinforced, water-blocked polyurethane cable 
Reversible Input Protection and Operation
2-second warm-up time and low power usage to avoid battery drain of datalogger or RTU
Signal conditioning to remove background noise

ORP-Electrode-Large-Reference-Reservoir-

Low Maintenance

The weak point of ORP sensors is their reference solution, which gets diluted by the sample over time. STs Series ORP sensors mitigate this problem by incorporating a reference half cell with a large reservoir. The high volume, combined with a low-flow reference gel and junction, reduces the dilution rate to provide stable measurements with less calibration.

pHionics Noise-Reduction-Technology graphic

Accurate Measurements

No noise. No nonsense. Experience the difference with pHionics noise reduction technology.

Specifications

ORP Sensor

Output	4-20 mA
ORP (redox) Range	-1000 to +1000 mV
Operating Temperature	0-70°C
Pressure Range	0-70 psi
Electrode Type	Platinum sensing element Silver/silver chloride gel-filled reference
Transmitter Type	2-wire
Automatic Temperature Compensation	None
Isolation	600 VDC
Power Supply Voltage	8-40 VDC
Warm-up Time	2 seconds
Loop Impedance (Max)	200 Ohms at 12 VDC 800 Ohms at 24 VDC 1600 Ohms at 40 VDC
Response time	95% < 20 seconds
Wetted Materials	316 Stainless Steel, PVDF, Viton™
Length	14.25 in (36.20 cm)
Width	0.750 in (1.9 cm) maximum
Weight (No cable)	0.50 lbs (0.227 kg)
Linearity	± 4 mV
Accuracy	± 4 mV*
Sensitivity	± 1 mV
Stability	± 2 mV
Repeatability	± 10 mV

*After proper calibration

Temperature Sensor

Output	4-20 mA
Temperature Range	0-50°C
Accuracy	+/- 1°C
Linearity	+/- 0.5°C
Power Supply Voltage	7-40 VDC

Cable

Cable Material	Polyurethane
Type	4 conductor, Kevlar® reinforced, water blocked, shielded, twisted-pair wiring
Maximum Distance	3 miles
Resistance per 1000 ft (304.8 m)	26 Ohms
Replaceable?	Yes