Sper Scientific 850086 Water Quality Meter pH Kit - Manual (Page 9)

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seconds, until the display reverts to the current reading.
D. AUTOMATIC SHUT OFF
The instrument has an automatic shut off function in order to prolong battery
life. After approximately 10 minutes without activity (no buttons pushed), the
meter will automatically shut off. To disable this feature, press the REC
button.
E. OVERLOAD INDICATOR
When the measurement is out of range, "- - - -" appears on the display.
Additional information may be contained in the individual probe instruction
manual(s).
F. BATTERY REPLACEMENT
•
Replace the battery when the low battery icon is displayed in the left
corner of LCD. In-spec measurements may be made for
several hours after the low battery indicator appears.
• Slide the battery cover away from the instrument, remove the
battery and replace with a 9V battery (alkaline or heavy duty type).
• Close the battery cover.
G. RS232 PC SERIAL INTERFACE
The instrument features RS232 output via a 3.5 mm terminal. The signal
output is a 16-digit data stream that can be adapted to user-defined applica-
tions. A RS232 lead with the following connection is required to link the
instrument with the PC serial interface.
See Fig.1, Pg.4 for inputs & button locations
Meter (3.5 mm jack plug) PC (9W ‘D” Connector)
Center Pin ..................................Pin4 Pin 2 2.2 K
Ground/shield .............................Pin 2 Pin 5 resistor