Stratos Multi E401N
159
12.8 Measuring Functions
12.8.1 pH
Digital input
For Memosens sensors (pH, ORP, pH/ORP)
Terminals 1 … 5 or MK-MS095N module
Display ranges
Temperature: -20.0 … 200.0 °C / -4 … 392 °F
pH value: -2.00 … 16.00
ORP: -1999 ... 1999 mV
rH value (with pH/ORP sensor): 0 … 42.5
Measurement error
Depending on sensor
Module input, analog
For analog pH and ORP sensors
Measuring ranges
Temperature: -20.0 … 200.0 °C / -4 … 392 °F
pH value: -2.00 … 16.00
ORP: -1999 ... 1999 mV
rH value (with pH/ORP sensor): 0 … 42.5
Glass electrode input
Reference temperature 25 °C/77 °F
Input resistance > 1 x 10
12
Ω
Input current < 1 x 10
-12
A
Impedance range: 0.5 ... 1000 MΩ (± 20 %)
Reference electrode input
Reference temperature 25 °C/77 °F
Input resistance > 1 x 10
10
Ω
Input current < 1 x 10
-10
A
Impedance range: 0.5 ... 200 kΩ (± 20 %)
Measurement error
1)
2)
pH value < 0.02, TC: 0.002 pH/K
mV value < 1 mV, TC: 0.1 mV/K
Temperature input via module
Pt100/Pt1000/NTC 30 kΩ/NTC 8.55 kΩ/Balco 3 kΩ
2-wire connection, adjustable
Measuring ranges
Pt100/Pt1000: -20.0 ... 200.0 °C/-4 ... 392 °F
NTC 30 kΩ: -20.0 ... 150.0 °C/-4 ... 302 °F
NTC 8.55 kΩ (Mitsubishi): -10.0 ... 130.0 °C/14 ... 266 °F
Balco 3 kΩ: -20.0 ... 130.0 °C/-4 ... 266 °F
Adjustment range
10 K
Resolution
0.1 °C/0.1 °F
Measurement error
1)
2)
< 0.5 K (< 1 K for Pt100; < 1 K for NTC > 100 °C/212 °F)
Temperature compensation
Off,
Linear characteristic 00.00 ... 19.99 %/K,
Ultrapure water,
Table: 0 … 95 °C, user-defined in 5-K steps
Reference temperature
25 °C/77 °F
1)
At rated operating conditions
2)
± 1 count, plus sensor error