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9 REFERENCE
155
Table 1 Measurement item specifications
Installation
environment
Flat and stable location with few vibrations or shocks
No dust, mist or corrosive gas in the air
Under atmospheric pressure
No direct sunlight
Good ventilation
Altitude 2000 m or lower
No.
Measurement item
Measurement
system
Measurement range
Repeatability
Calibration method
1
Turbidity
Transmitted
light
absorbance
method
0 FTU to 2 FTU
0 FTU to 4 FTU
±2.5% of full scale
Formazine standard
solution or polystyrene
latex standard solution
2
Color
Transmitted
light
absorbance
method
0 CU to 10 CU
0 CU to 20 CU
±5.0% of full scale Standard color solution
3
Residual chlorine
Polarographic
method
0 mg/L to 2 mg/L
±2.5% of full scale
DPD colorimetric method
4
Water pressure
Semiconductor
detection
method
0 MPa to 1 MPa
±1.0% of full scale Standard pressure gauge
5
pH (optional)
Glass electrode
method
pH 2 to pH 12
±0.1 pH
pH 7, pH 9 standard
solution
6
Conductivity
(optional)
AC 2 pole
method
0 mS/m to 50 mS/m
±2.0% of full scale KCl standard solution
7
Water temperature
(optional)
Thermistor
method
0
C to 50
C
±0.5
C
Standard thermometer
Summary of Contents for TW-100
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