6
COMBINED
pH or ORP
ELECTRODES
REFERENCE
ELECTRODE RESET
RECORDER
0-2 VOLT
TEMPERATURE
PROBE
1
2
3
4
5
6
DC
POWER
12V
to
20V
+
THE REAR PANEL OF HI8417
1. BNC socket for pH and ORP electrode.
2. Reference Jack socket for reference electrode.
3. RESET button.
4. Recorder output connections.
5. Temp. Probe socket (for HI7669/2W).
6. DC Power Socket (for HI710005 or HI710006).
Electrode and probe connections
For combination
pH or ORP
electrodes (with internal reference) plug
the electrode's BNC to the socket provided (#1).
For an electrode with a separate reference, connect the measuring
electrode's BNC to the BNC socket (#1) and the reference electrode's
jack to the socket provided (#2).
For
temperature
measurements and automatic temperature com-
pensation connect the temperature probe to the °C socket (#5).
Recorder Output
HI8417
is provided with a recorder output from 0 to 2 volts. Connect
the recorder output (#4) and select the pH or mV range by pressing
the pH/mV key. The output signal is related to the values as follows:
pH output:
0.01 pH = 1.42857 mV
e.g.
0.00 pH = 0 mV
7.00 pH = 1000 mV
14.00 pH = 2000 mV
mV output:
0.1 mV = 0.05 mV
e.g.
-1999 mV = 0 mV
0.0 mV = 1000 mV
+1999 mV = 2000 mV
The output impedance is 100 ohms. The maximum output short-
circuit current is 20 mA.
RESET button
The RESET button (#3) is used when the instrument displays errone-
ous messages due to strong electrical interference or when the
