5
• Temperature compensation of the pH reading (for
HI21
series only).
• Manual temperature setting when the temperature probe
is not inserted or temperature exceeds the upper range.
• Internally recorded last calibration data (non-volatile EE-
PROM memory): calibration date and time, pH offset, pH
slopes, number of calibration points and correspondent
pH values (for
HI21
series only) or calibration date and
time and the mV calibration points used (for
HI22
series
only).
• Input: pH electrode with BNC connector.
• ±5 Vdc output for amplified electrodes (max 10 mA).
• Output:
- isolated 0-1 mA, 10 K
maximum load (optional);
- isolated 0-20 mA, 750
maximum load (optional);
- isolated 4-20 mA, 750
maximum load (optional);
- isolated 0-5 Vdc, 1 K
minimum load (optional);
- isolated 1-5 Vdc, 1 K
minimum load (optional);
- isolated 0-10 Vdc, 1 K
minimum load (optional).
• Real time clock.
