User manual
PONSEL
Reference: NOTICE_ACTEON_2010_v001-UK
V: 001
51/56
12 Technical specifications:
Operating temperature
-25 °C to +55 °C
Storage temperature
-25 °C to +65 °C
Power supply
230VAC 50Hz (10VA). Available in 110 VAC
12 - 24 VDC (24V optional)
Fuse
Protected by a 250mA fuse
Leak-tightness – IP degree
IP 65
Standard:
CE
13 The sensors
13.1 The pH sensor
13.1.1 Specifications
Length of glass part:
65 mm
Working range:
0-14 pH (insensitive to Na+ ions up to pH 13)
Working temperature:
-5 to 50°C
Pressure:
Max. 5 bars.
Cable:
anti-static coaxial cable, max. length 10m.
Response time:
1 second per metre of cable.
Minimum measurement volume: 0.5ml
13.1.2 Description
The pH sensor is made up of :
-
A “glass electrode” made up of a special very fine glass bulb sensitive to pH, soldered to the tip of a
crystal tube. The resistance of the electrode is around 1000 M
Ω
*.
The glass pH bulb is protected by a polyethylene strainer.
* Requires at a minimum an input circuit of 10
5
M
Ω
.
-
An Ag/AgCl type plasticized electrolyte saturated KCl “Plastogel®
1
” “reference electrode”.
The Plastogel® electrolyte is in direct contact with the external environment without interposition of
capillary or porous material. There is therefore no risk of clogging or de-priming of the reference (the
risk of splicing error is low since there is a large contact surface).
-
The mechanical resistance of the sensor and leak-tight sealing of the cable are ensured by a shaft made
out of a plastic material (Delrin).
1
Constant potential electrode to complete the electrical circuit: Potential = +0.188V at 20°C (a chlorided silver
wire immersed in the plasticised electrolyte saturated with potassium chloride).
