Thermo orion 135A, Instruction Manual

Page: 45 / 56

Models 135A and 136S Portable Conductivity Meters
Appendix 39
Specifications
Ranges Conductivity: 0.1
m
S/cm to 1,000 mS/cm
(c > 0.8 cm
–1
)
0.1
m
S/cm to 500 mS/cm
(c = 0.2 to 0.8 cm
–1
)
0.01
m
S/cm to 199.9
m
S/cm
(c < 0.2 cm
–1
)
Temperature: –20.0 to +120.0
°
C / –4 to 248
°
F
nLF: 0 to 120
°
C
Salinity: 0.0 to 45.0 g/kg (0 to 30
°
C)
TDS: 0 to 1,999 mg/l (10 to 40
°
C)
Display LCD 35 x 67 mm, character height 15 mm
Measurement cycle Approx. 2 sec
Accuracy
(+ 1 count) Conductivity: < 0.5 % of measured value
1)
Temperature: < 0.3 K
Input 1
(Sensor) Multi-contact for 2 and 4-electrode sensors with inte-
grated temperature probe
Input 2
(Temperature) 4 mm sockets for separate temperature probe
Permissible cell
constant 0.010 to 199.9 cm
–1
(adjustable)
Sensor
standardization Direct entry of the cell constants,
Automatic determination of the cell constants with
Thermo Orion conductivity standards
Sensor standardization with any known solutions
Meter self-test During power-up, segment test, memory test, display
of model no. and software version
Temperature
measurement NTC 30 k
W
(automatic recognition during power-up)
or manual temperature entry
Temperature
compensation Linear characteristic: 0.01 to 9.99 %/
°
C
nLF (non-linear characteristic for ultrapure water and
natural water)
Data logger Manual, interval-controlled or event-controlled
Data points 100 memory locations: conductivity, salinity or TDS,
with temperature, date and time
1)
For conductivities > 500 mS/cm < 1% meas. value