Hanna Instruments HI 255 - Manual (Page 4)

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) key, to manually decrease temperature value or other parameters.
ATC key (alternate function), to select EC temperature compensation mode.
5) key, to manually increase temperature value or other parameters.
TC key (alternate function), to view the temperature coefficient value.
6) LOG key, to store measured data.
RCL key (alternate function), to enter/exit recall mode.
7) ALT key, to select alternate key function.
8) LOCK/CLR key, to freeze current EC range on the LCD or to clear pH
calibration parameters.
SET key (alternate function), to enter/exit setup mode.
9) RANGE key, to switch measurement unit pH/mV/EC or focused data.
MODE key (alternate function), to select measurement mode/pH resolution.
10) ON/OFF switch.
11) Power supply socket.
12) Conductivity socket.
13) BNC electrode connector.
14) Electrode reference socket.
15) Temperature probe socket.
16) RS232 serial communication connector.
FUNCTIONAL DESCRIPTION
Front Panel Primary LCD
Secondary LCD
1
9 3
2
7
4
6
5
10
8
11 13 14 15
Rear Panel
16
POWER
12VDC
INPUT TEMP RS232
PROBE
12
ALT Functions Functions
RCL
LOG ALT
SET
LOCK/CLR
ATC TC
MODE
RANGE
GLP
CFM CAL
pH/mV & EC/TDS/NaCl
HI 255 Combined Meter
TC Factor TC
ATC Select Temperature
Compensation
Recall Log Data RCL
SET Set Parameters
Select Measure Mode MODE
Confirm/GLP Data CFM/GLP
Calibration CAL
Change Parameter Value
Store Log Data LOG
Lock Current Range
Clear Calibration LOCK/CLR
Select Measure Unit
Scroll Log Data RANGE
REF
/
BUFFER pH
INTV DATE TIME %
ppm
S 3
2 1
BUF WRONG
READY
CFM
NaCl
pH mV g / l LOG CAL