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Overview

Overview

Product Features
  • Analog controller/transmitter for pH/ORP measurement
  • Low and high ohm pH input
  • Reliable measurements by automatic temperature compensation with NTC, Pt100 or Pt1000
  • With integrated PID control function
  • For specific drinking water electrodes SenTix® ML 70 (ORP)

The WTW pH 298 monitor is an economical and metrologically flexible solution for use in the field. Consequent galvanic separation of all outputs.

The pH 298 is equipped with a low and a high ohm signal input. Thus, the monitor not only can be operated with WTW SensoLyt® measuring probes/electrodes and WTW ProcessLine® electrodes. If the adapted probes are not equipped with an integrated NTC sensor, you can connect any NTC, Pt100/Pt1000 sensors to measure temperature and for automatic temperature compensation.

Model Variations

pH 298 NTC - analog trasmitter pH/ORP, NTC, 230V
pH 298 NTC/24V - analog transmitter pH/ORP, NTC, 24V
pH 298 Pt100 - analog transmitter pH/ORP, Pt100, 230V
pH 298 Pt100 - analog transmitter pH/ORP, Pt100, 24V
pH 298 Pt1000 - analog transmitter pH/ORP, Pt1000, 230V
pH 298 Pt1000/24V

Specifications

Specifications

 
 
Specifications
pH 298
Oxi 298
LF 298
Cl 298
Order No.
191230, 191232, 191234
291230, 291234
391230, 391234
801254
Parameter
pH/ORP
Oxygen
Conductivity
Chlorine, electrochemical
Measuring range
-2 … 16 pH -2000 … +2000 mV
0 … 20 mg/l 0 … 200 %
0 … 500 mS/cm, different measuring ranges adjustable
0 … 2 mg/l
Temperature Measurement *)
-10 … 130 °C NTC or Pt1000 or Pt100
-10 … 130 °C NTC or Pt1000
-10 … 130 °C NTC or Pt1000
-10 … 130 °C Pt1000
Temperature Compensation
Automatically via temperature measurement in the sensor or via manual input
Automatically via temperature measurement in the sensor or via manual input
Automatically via temperature measurement in the sensor or via manual input
Automatically via temperature measurement in the sensor or via manual input
Relays
2 x switching contacts, change-over, max. 250 VAC / 5 A
2 x switching contacts, change-over, max. 250 VAC / 5 A
2 x switching contacts, change-over, max. 250 VAC / 5 A
2 x switching contacts, change-over, max. 250 VAC / 5 A
Current Outputs
2 x 0(4) … 20 mA
2 x 0(4) … 20 mA
2 x 0(4) … 20 mA
2 x 0(4) … 20 mA
Digital Interface
Modbus / RS485; USB (for configuration, calibration, data recording)
Modbus / RS485; USB (for configuration, calibration, data recording)
Modbus / RS485; USB (for configuration, calibration, data recording)
Modbus / RS485; USB (for configuration, calibration, data recording)
Display
OLED (128 x 64 pixel) with plain text menu
OLED (128 x 64 pixel) with plain text menu
OLED (128 x 64 pixel) with plain text menu
OLED (128 x 64 pixel) with plain text menu
Data Logger
Integrated with real time clock for 4000 datasets, storable via USB, graphic display
Integrated with real time clock for 4000 datasets, storable via USB, graphic display
Integrated with real time clock for 4000 datasets, storable via USB, graphic display
Integrated with real time clock for 4000 datasets, storable via USB, graphic display
Electric Supply
100 … 240 V AC or 18 … 36 V DC
100 … 240 V AC or 18 … 36 V DC
100 … 240 V AC or 18 … 36 V DC
100 … 240 V AC or 18 … 36 V DC
Ambient Conditions
Operational temperature: -10 … 55 °C
Operational temperature: -10 … 55 °C
Operational temperature: -10 … 55 °C
Operational temperature: -10 … 55 °C
Housing Material
Cast Aluminium for wall mounting
Cast Aluminium for wall mounting
Cast Aluminium for wall mounting
Cast Aluminium for wall mounting
Protection Rating
IP 65
IP 65
IP 65
IP 65
Weight
2 kg
2 kg
2 kg
2 kg
Warranty
2 years
2 years
2 years
2 years

*) Please note: The permitted operating voltage of the sensor can vary considerably
 

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