Jenway 3540 - Manual (Page 13)

2.2.3 Power Supply, probes and accessory connection
Rear Panel showing Input and Output Connectors
1. Ref Socket
2mm-pin type socket. Connection socket for separate reference
electrode. When performing measurements with some pH and
ion selective electrodes a separate reference electrode is
needed.
2. pH Socket
BNC type socket which allows combination pH or redox
electrodes to be used.
3. Temp Socket
8-pin mini-DIN socket. This allows the supplied Automatic
Temperature Compensation (ATC) probe to be connected.
4. Conductivity Socket
7-pin DIN socket. This allows the conductivity cell to be
connected.
5. Alarm Output
2x4mm sockets. Open collector alarm outputs.
Red for High / Black for Low.
6. Printer Socket
9-way socket for RS232 serial communication, for serial printer,
PC connection or other data communication.
7. Power In
AC 9V I/P socket. 2.1 x 5.5mm socket allowing the power
supply to be connected to the instrument.
8. Analog O/P
Two 4mm sockets. Analogue output for selected channel.