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Description
5. DESCRIPTION
5.1. Area of application
The 8202 transmitter is intended solely for the measurement of:
• the pH in clean liquids or liquids containing solids, sulphides or proteins.
• or the oxidation reduction potential in clean liquids or liquids containing solids, sulphides or proteins which may
present low conductivity.
Thanks to two fully adjustable transistor outputs, the transmitter can be used to switch a solenoid valve, activate
an alarm and, thanks to one or two 4-20-mA current outputs, establish one or two control loops.
5.2. General description
5.2.1. Design
The 8202 transmitter comprises:
• a module for measuring process values, comprising:
- a pH or Redox sensor measuring a potential difference (PD) in mV
- a Pt1000 temperature sensor built in the holder of the pH or Redox sensor, measuring a resistance.
• an acquisition / conversion module for the process values measured:
- measured PD acquisition in mV
- conversion of the measured PD into pH units (for a transmitter with pH sensor only)
- acquisition of the resistance measured and conversion into temperature
• a display module with browse button used to read and/or configure the parameters of the device. The display
module is available as an accessory.
One version of the 8202 transmitter with two transistor outputs and a 4-20 mA output operates on a 2-wire
system and requires a power supply of 14-36 V DC. For such a version, electrical connection is done via an M12,
5-point, male fixed connector.
One version of the 8202 transmitter with two transistor outputs and two 4-20 mA outputs operates on a 3-wire
system and requires a power supply of 12-36 V DC. For such a version, electrical connection is done via an M12,
5-point, male fixed connector and an M12, 5-point, female fixed connector.
5.2.2. pH or Redox probe
The transmitter 8202 can be fitted with a standard probe 120 mm long, measuring the pH or the oxidation
reduction potential.
It is screwed into a holder with the built-in Pt1000 temperature probe.
• The pH probe is a glass membrane with variable sensitivity according to the pH. When the pH probe is
immersed in a solution, a difference in potential is formed, due to the hydrogen ions (H+), between the glass
membrane and the solution. This difference in potential, measured in relation to a reference electrode, is directly
proportional to the pH value (59.16 mV per pH unit at 25°C).
• When a Redox probe is immersed in a solution, an exchange of electrons occurs based on the oxidizing and
reducing effects of an electrolyte. The resulting voltage is the oxidation reduction potential.
English
Type 8202 ELEMENT
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