4
1) Liquid Crystal Display (LCD).
2)
CFM/GLP
key, to confirm different values or to display Good Laboratory
Practice information.
3)
CAL
key, to enter and exit/escape calibration mode.
4) /ºC key, to manually decrease temperature value or other parameters.
5) /ºC key, to manually increase temperature value or other parameters.
6)
RCL
key, to enter/exit recall mode.
7)
LOG
key, to store measured data.
8)
SET/CLR
key, to enter/exit setup mode, clear pH calibration or delete
logged data.
9)
RANGE
key, to select measurement range (
HI 251
only) or to switch
focused data.
10)
ON/OFF
switch.
11) Power supply socket.
12) BNC electrode connector.
13) Electrode reference socket.
14) Temperature probe socket.
15) RS232 serial communication connector.
FUNCTIONAL DESCRIPTION
Front Panel
Primary LCD
Secondary LCD
1
9
3
2
7
4
6
5
10
8
POWER
12VDC
INPUT
REF
TEMP
11
12
13
14
Rear Panel
C
CAL
CFM
READY
1
2
3
BUF
WRONG
LOG
mV pH
TIME
%
DATE INTV
BUFFER pH
RS232
15
Functions
pH Calibration - 3 points
RCL
LOG
CLR
SET
C
C
RANGE
GLP
CFM
CAL
pH / ORP Meter
HI 251
Confirm Calibration
in selected pH Buffer
CFM
Select pH Buffer
/
Start/Exit Calibration
CAL
Select pH/ORP/
mV
Scroll Log Data
Rel
RANGE
GLP
Show GLP Data
LOG
Store
Log Data
SET/CLR
Set Instrument Parameters
Clear Calibration/Log Data
RCL
Recall
Log Data
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