Hanna Instruments HI 93542 - Manual (Page 6)

11 10
HOLD and MR FUNCTIONS
The HOLD function is activated by press-
ing the HOLD key.
The measured temperature is held on the
display until HOLD is pressed again. The
"HOLD" tag blinks on the display while in
HOLD mode.
Note: Although the display is frozen, internally the meter continues
measuring and updating Hi/Lo, relative and average values.
In HI 93551R, HI 93552 and HI 93552R, the held value is also
stored in non-volatile memory and can be recalled by pressing
(ALT+) MR keys. While the MR key is held, the "HOLD" tag lights up
and the meter displays the stored value; when the MR key is
released, after 1 second the meter returns to normal measurement
mode.
HIGH/LOW TEMPERATURES
The maximum and minimum tempera-
tures are continuously monitored and
displayed on the lower portion of the LCD.
Note: When the reading goes over-range or the probe is removed,
the Hi and Lo values display dashes until cleared.
CLEAR FUNCTION
Upon pressing the CLR key, the High/Low
values may be cleared at any time dur-
ing measurement and the current reading
is assigned to the highest and lowest
temperature values for the displayed chan-
nel only.
In HI 93551R, HI 93542, HI 93552 and HI 93552R models,
pressing CLR also resets relative and average values.
AUTO SHUT-OFF
To save battery life, the meters are provided with an auto-off feature,
which switches the meter off after 60 minutes of nonuse.
In HI 93551, HI 93551N and HI 93542 models, to disable this
feature set the internal slide-switch located in the battery compart-
ment (see figure on page 10).
OPERATIONAL GUIDE
To switch the instrument ON, press the ON/OFF key.
The thermometer will carry out a self diagnostic test routine, the LCD will
show all segments for a few seconds (or as long as ON/OFF is held),
followed by the percentage indication of the remaining battery life.
The thermometer then enters normal measurement mode.
If a temperature probe is plugged in, the meter displays the
measured temperature.
If no probe is plugged in, or if the reading is
over-range, the display shows flashing dashes.
If a measurement is slightly over the range of
the meter specifications, the display will flash
the closest full-scale value.
To switch the meter OFF, press the ON/OFF key.
Note: The meters are provided with an acoustic signal feature activated
when buttons are pressed, which can be disabled using a switch
located in the battery compartment (see figure on page 10).
°C/°F SELECTION
Measurements can be displayed in either degrees Celsius or Fahren-
heit. The meter is factory set to °C scale; to change the scale, press
°C/°F key (HI 93551, HI 93551N and HI 93551R) or (ALT+)°C/°F
keys (HI 93552 and HI 93552R), or set the switch located in the
battery compartment (HI 93542, see figure on page 10).
THERMOCOUPLE TYPE SELECTION, KJT
By pressing KJT (HI 93551, HI 93551N and HI 93542) or (ALT+)KJT
keys (HI 93551R, HI93552 and HI 93552R), the thermometer is set
according to the connected thermocouple type. The corresponding
symbol will be displayed, i.e. K for K-type, J for J-type, T for T-type.
Note: Changing thermocouple type resets the HI and LO values.