C931 • C932 • C933 7 / 47
Inputs
The measuring electrode should be connected to the coaxial INPUT connector. If
separate electrodes are used, connect the reference electrode to the REF. ter-
minal. Automatic temperature compensation and temperature measurements are
possible by plugging a Pt1000 temperature probe into the °C terminals. You can
also use a combination pH electrode with built-in Pt1000. Its banana plugs should
be inserted in the °C terminals. Without Pt1000, the manual temperature com-
pensation is automatically switched on.
Recorder output
A recorder can be connected to the red (+) and black (-) terminals. Use only labo-
ratory recorders with a high input impedance!
Digital output
A standard RS232 output terminal (DP9) is provided for interfacing the instru-
ment with a printer or computer. Data is sent in the ASCII code at a BAUD rate
of 300...9600 bps (8 bit, no parity, 1 stopbit).
Serial port pinout specifications:
pin 1 : connected to pin 4 and pin 6
pin 2 : TxD, transmit data
pin 3 : RxD, receive data
pin 4 : connected to pin 1 and pin 6
pin 5 : Gnd, signal ground
pin 6 : connected to pin 1 and pin 4
pin 7 : connected to pin 8
pin 8 : connected to pin 7
pin 9 : not connected
System
1. Select [MENU] by pressing MODE.
2. Select [SYSTEM] and press CAL.
3. Follow the instructions on the screen to adjust language, contrast and automa-
tic power-off timer.
Date and Time
1. Select [MENU] by pressing MODE.
2. Select [DATE/TIME] and press CAL.
3. Adjust the date by pressing CAL each time.
4. Adjust the time by pressing CAL each time.
Recorder
1. Select [MENU] by pressing MODE.
2. Select [RECORDER] and press CAL.
3. Select the desired channel and press CAL.
4. Select the desired range and press CAL.
5. Select the desired minimum level corresponding to a 0 V recorder output and
press CAL.
6. Select the desired maximum level corresponding to a 2 V recorder output and
press CAL.
Password
1. Select [MENU] by pressing MODE.
2. Select [PASSWORD] and press CAL.
3. A private code can be programmed to avoid undesired access to the instru-
ment. Press CAL and follow the instructions on the screen to enter your secret
sequence of 5 keys.
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