Process Analyzer Electrodeless Conductivity Salinity Sensors

  • Process analyzer electrodeless (toroidal) conductivity salinity sensors
  • Pt100 / Pt1000 temperature sensor input
  • Certified for Hazardous Location
  • High conductivity contactless salinity sensor
  • Color Coded User Interface
  • Alarm and control relays
  • Analog outputs
  • Explosion protection rated Class 1 Div 2
  • Panel or Pipe Mount.

The STPro is a sophisticated monitor / controller for toriodal and similar electrodeless conductivity sensors. It features a comprehensive monitor and control interface and is certified for use in hazardous locations (NFPA Class 1 Div2 . The controller provides relay and analog output signals and includes a PID control loop. The unit can be set to readout directly in Conductivity or %Salinity or Concentration units

The color-guided user interface on a backlit widescreen display guarantees maximum operating safety for 4- and 2-wire devices. The unique, functional colored backlighting of the Stratos® Pro display changes between 6 different colors to clearly signal operating states.

The normal measuring mode is white. Information texts appear on a green screen and the diagnostic menu appears on turquoise. The orange HOLD mode is quickly visible as is the magenta screen which indicates asset management messages for predictive diagnostics – such as maintenance request, pre-alarm, and sensor wear.

The alarm status has a particularly noticeable red display color and is also signaled by flashing display values. Unreliable entries or false passcodes cause the entire display to blink red so that operating errors are noticeably reduced.

Controller for Conductivity Salinity

INPUTS  
Conductivity input for electrodeless conductivity sensors
Effective Ranges conductivity 0.000 … 1999 mS/cm
concentration 0.00 … 100.0 % by wt
salinity 0.0 … 45.0 ‰
Temperature compensation*} (reference temperature 25 °C)
linear 00.00 … 19.99 %/K (user-defined reference temperature)
natural waters to EN 27888
NaCl from 0 (ultrapure water) to 26 % by wt (0 … 120 °C)
Concentration determination NaCl 0–26 % by wt (0 °C) … 0–28 % by wt (100 °C)
HCl 0–18 % by wt (–20 °C) … 0–18 % by wt (50 °C) NaOH 0–13 % by wt (0 °C) … 0–24 % by wt (100 °C) H2SO4 0–26 % by wt (–17 °C) … 0–37 % by wt (110 °C)
HNO3 0–30 % by wt (–20 °C) … 0–30 % by wt (50 °C)
H2SO4 94–99 % by wt (–17 °C) … 89–99 % by wt (115 °C)
HCl 22–39 % by wt (–20 °C) … 22–39 % by wt (50 °C)
HNO3 35–96 % by wt (–20 °C) … 35–96 % by wt (50 °C)
H2SO4 28–88 % by wt (–17 °C) … 39–88 % by wt (115 °C)
NaOH 15–50 % by wt (0 °C) … 35–50 % by wt (100 °C)
Temperature Pt 100 / Pt 1000 / NTC 30 kohms / NTC 30 kohms
Measuring range Pt: –50.0 … +250.0 °C (–58.0 … +482.0 °F)
NTC: –20.0 … +150.0 °C (–4.0 … +302.0 °F)
Current input (TAN) analog, 0/4 … 20 mA for external temperature signal
HOLD input, digita 0 … 2 V (AC/DC) HOLD inactive
10 … 30 V (AC/DC) HOLD activ
CONTROL input, digital

parameter set selection 0 … 2 V (AC/DC) parameter set A
10 … 30 V (AC/DC) parameter set B

flow pulse amplitude 10 … 30 V DC
pulse input for flow measurement 0 … 100 pulses/s
display: 00.00 … 99.99 l/h
message via 22 mA, alarm contact or limit contacts

   
OUTPUTS  
Output 1, Output 2 0/4 … 20 mA, max. 10 V, 22 mA for error message
Process variable*} conductivity, resistivity, concentration, salinity, or temperature
Characteristic linear, bilinear, or logarithmic
Output filter*} PT1 filter, filter time constant: 0 … 120
Contacts alarm, wash (parameter set A/B), limits 1/2
Contact Ratings AC < 250 V/< 3 A/< 750 VA
DC < 30 V/< 3 A/< 90 W
PID Process Controller output via limit contacts 1/2
Controller Type pulse length controller or pulse frequency controller