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PB-RX
PB-RX
Fig. 27
11.0 - DOSING PUMP WITH RX METER
This unit is a dosing pump with integral Rx controller designed to measure, control, and regulate the Rx value.
The PB-RX pump utilize an on-off mode to stop dosing once the Rx value reaches set point.
The Rx measurements can be affected by such factor as temperature, the pressure existing at the point of inser-
tion of the measuring electrode, and the efficiency of the electrical insulation of the process plant.
Measuring range:
+ 1.400
- 1.400;
Upon request:
4 ÷ 20 mA output and relay output.
11.1 - ACCESSORIES
• 1 flexible PVC suction hose, transparent crystal type, length 2 m;
• 1 semirigid polyethylene hose, white, length 2 m;
• 1 injection valve 3/8 BSP m;
• 1 filter;
• 1 insulated tool for calibration;
• 1 instructions/operating booklet.
A
L
M
11.2 - TYPICAL INSTALLATION (Fig. 28)
A Injection valve
B
T
B Power supply
C Filter
D Floating level switch
G
H
E Electrode
V
G Level switch connector
H Cable gland
P
I
Chemical tank
L 4 ÷ 20 mA output connector
D
M Relay output
C
P Electrode holder
I
T Electrode connector
V Process plant
Fig. 28
11.3 - LEVEL CONTROL
The dosing pump is supplied with level control setting and upon request floating level switch. When the level
of the additive is lower than the switch, level alarm and yellow L.E.D. are ON: the pump is OFF.
The level control alarm goes ON with 5 seconds delay.
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50
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