5 Specifications
98
pH
measurement
Two calibration
Measurement
method
Glass electrode method
Range
pH 0 to 14
Resolution
0.01 pH
Precision
*2
±0.1 pH
Dissolved
oxygen
measurement
S a l i n i t y
conversion
(0 to 70 PPT,
automatic)
A u t o m a t i c
temperature
compensatio
n
Measurement
method
Polarographic method
Film thickness 25
m
Range
0 mg/L to 50.0 mg/L
Resolution
0.01 mg/L
Precision
*2
0 mg/L to 20 mg/L: ±0.2 mg/L
20 mg/L to 50 mg/L: ±0.5 mg/L
Electrical
conductivity
measurement
Auto range
A u t o m a t i c
temperature
conversion
(25
C)
Measurement
method
Four-AC-electrode method
Range
0 S/m to 10 S/m
(0 mS/cm to 100 mS/cm)
Resolution
0.000 mS/cm to 0.999 mS/cm:
0.001
1.00 mS/cm to 9.99 mS/cm:
0.01
10.0 mS/cm to 99.9 mS/cm: 0.1
0.0 mS/m to 99.9 mS/m: 0.1
0.100 S/m to 0.999 S/m: 0.001
1.00 S/m to 9.99 S/m: 0.01
Precision
*2
1% of full-scale (midpoint of two
calibration points)
Salinity
measurement
Measurement
method
Electrical conductivity
conversion
Range
0 PPT to 70 PPT
(parts per thousand)
Resolution
0.1 PPT
Precision
±3 PPT
TDS (total
dissolved solid)
measurement
Conversion
c o e f f i c i e n t
setting
Measurement
method
Electrical conductivity
conversion
Range
0 g/L to 100 g/L
Resolution
0.1% of full-scale
Repeatability
±2 g/L
Precision
±5 g/L
Seawater
specific gravity
measurement
t,
0,
15
display
Measurement
method
Electrical conductivity
conversion
Range
0
t to 50
t
Resolution
0.1
t
Precision
±5
t
Specification
Basic value
Model
U-51 U-52 U-52G U-53 U-53G U-54 U-54G
Summary of Contents for U-51
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