Data
65
Note
Although an arrestor (400 V discharge starting voltage) is mounted for the transmission output,
contact input, and communication, install an optimum surge absorber element on the connection line,
depending on the surrounding environment, device installation conditions, and externally connected
devices.
J
Detector unit
Q
Detector and measuring cell
Product name
Rotating electrode polarographic residual chlorine sensor
Model
RA-30
Measurement method
Rotating electrode polarographic method
Measurement target
Free residual chlorine in sample water
Measurement range
0 mg/L to 3.00 mg/L
Temperature compensation
Automatic temperature compensation using Pt1000
Performance
Linearity
Within
±
5
%
full-scale range
Repeatability
Within
±
2
%
full-scale range or
±
0.05 mg/L, whichever is larger
Response time
Within 120 s from the inlet of the measuring cell (90
%
response)
Zero drift
Within
±
1
%
full-scale range/month
Span drift
Within
±
10
%
full-scale range/month
Sample
condition
*5
Temperature
0
°
C to 45
°
C
*3
Flow rate
Measuring cell flow rate: 0.1 L/min to 0.5 L/min
Primary pressure
0.01 MPa to 0.15 MPa
*1
pH value
5.8 to 8.6 (with no fluctuation over 1.0 pH)
*2
Electrical conductivity 8 mS/m or above
*3
Calibration
Zero calibration
Zero water calibration, electrical zero calibration
Span calibration
Comparative calibration with the value measured with the DPD method
(including electrical zero calibration)
Material of liquid contact section
PVC, PPO, PTFE, EPDM, Si
Material of electrode
Au, AgCI
Material of beads
Ceramic beads
Material of filter
Nylon
Piping
connection
sample inlet
Rc1/4
sample outlet
VP13
Cleaning method
Physical cleaning with beads
Cable length
Provided standard cable: 1.5 m, maximum extension distance: 10 m
Operating temperature range
0
°
C to 45
°
C
*4
Operating humidity range
Relative humidity: 5
%
to 90
%
(no condensation)
Storage temperature
0
°
C to 45
°
C
External dimensions
110 (W)
×
340 (H)
×
110 (D) mm (excluding brackets)
Mass
Approx. 1.5 kg
Standard accessories
Beads, abrasive paper
*1: The measurement section is under an open air environment.
*2: If pH of the measured sample varies, the value of residual chlorine also varies. Perform measurement in an
environment in which pH variations are less likely to occur.
