Hach ISENO3181, Руководство пользователя, Страница: 5 / 18

Section 1 Product overview
The Intellical ISENO3181 series probes are digital, combination ion-selective electrodes (ISE) that
measure the concentration of nitrate in general water samples. The probes have a built-in
temperature sensor, a non-refillable gel reference and non-replaceable membranes. Refer to
Figure 1 .
Figure 1 Probe overview
1 Sensing element 3 Sensor protection cap
2 Reference junction 4 Cable
Section 2 Specifications
Specifications are subject to change without notice.
Specifications Details
Probe type Digital combination probe with a non-refillable reference junction
and a built-in temperature sensor
Measurement range 0.1 mg/L (7x10
–6
M) to 14,000 mg/L (1 M) NO
3
–
—N
Accuracy ±0.02 mV or 0.05% (the larger value)
Sample pH range pH 2 to 11 (pH 3 to 5 after the addition of Nitrate ISA)
Reference type Ag/AgCl
Reference junction Double junction (ceramic porous pin and annular porous PTFE)
Slope 58 mV/decade (90 to 110% at 25 °C (77 °F) in linear range per
Nernstian theoretical value)
Linear region 0.7 mg/L to 14,000 mg/L NO
3
–
—N
Temperature accuracy ±0.3 °C (±0.54 °F)
Temperature sensor type 30 kΩ NTC thermistor
Operating temperature 0 to 50 °C (32 to 122 °F)
Storage temperature 5 to 35 °C (41 to 95 °F)
Response time in linear region < 60 seconds (application dependent)
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