Note:
When the DTL84 is connected to an external device (PC, laptop, tablet etc), the recall
function is disabled.
3.10 Max/Min/Avg
When this function is selected, the DTL84 simultaneously monitors and stores the maximum,
minimum and average results. The DTL84 will continue to update and refresh the data until the
user exits this function
To enter the function and display the maximum recorded value, press
W
MIN
MAX
AVG
.
The
MAX
symbol will
be displayed.
Successive presses of
W
MIN
MAX
AVG
will display the following in sequence:
The minimum recorded value.
The
MIN
symbol will be displayed.
The average recorded value
.
The
AVG
symbol will be displayed
Real time readings
W
MIN
MAX
AVG
.
The
MAX
,
MIN
and
AVG
symbols flash.
To exit MAX/MIN/AVG, press
W
MIN
MAX
AVG
and hold for 2 seconds.
3.11 Temperature Scale Selection
Press
°
C
°
F
W
to switch between Celsius (°C) and Fahrenheit (°F)
3.12 Temperature Measurement
The maximum temperature measurement of the DTL84 for a K-type thermocouple is 1372°C.
The K-type thermocouple probe supplied is specified to 200 °C. Be sure that the thermocouple
probe is adequate for the measurement being made.
Connect a thermocouple probe/s, suitable for the type of temperature measurement and
temperature range being made, to the thermocouple input socket/s.
Set the DTL84 for the selected thermocouple type (see 4.3).
Taking all necessary safety precautions position the thermocouple/s at the surface or in the
medium to be measured and read the measured temperature from the display.
Note:
Repeated flexing can break the thermocouple leads. To prolong lead life, avoid sharp
bends in the leads, especially near the connector.
3.13 Differential Temperature Measurement
Connect thermocouple probes, suitable for the type of temperature measurement and
temperature range being made, to the thermocouple input sockets T1 and T2.
Set the DTL84 to the T1-2 differential temperature mode (see 4.7) and the selected
thermocouple type (see 4.3).
Taking all necessary safety precautions position the thermocouples at the surfaces or in the
mediums to be measured.
The difference between the measured temperatures of thermocouples T1 and T2 will be
displayed at the bottom of the LCD.
6
4. Set-up
Press
SET
to enter set-up. Press
SET
again to exit set-up.
Note:
When the DTL84 is connected to the user’s chosen device (PC, laptop, tablet etc), set-up
cannot be entered.
Press the arrow keys
W
HOLD
REC
W
W
MIN
MAX
AVG
°
C
°
F
W
to select settings and to adjust parameters.
Press
MEM
W
to save changes and move to the next set-up option.
4.1 Set Bluetooth ON/OFF
Press
W
HOLD
or
REC
W
to turn the Bluetooth ON or OFF.
Note:
When switching the Bluetooth function ON or when entering the standby/pairing mode, the
blue LED in the
SET
button flashes every 3 seconds. When successfully connected, the
blue LED will flash every second.
4.2 Select Thermocouple Type
The DT84 can be set for the following thermocouple types: K, J, E, T, N, R and S.
Press
W
MIN
MAX
AVG
or
°
C
°
F
W
to select the thermocouple type.
4.3 Setting the Data Recording Interval Time
Press
W
MIN
MAX
AVG
or
°
C
°
F
W
to set the minutes and/or seconds.
Press
W
HOLD
or
REC
W
to increase/decrease the values.
Note:
The set interval time range is 1 second (00:01) to 60 minutes 59 seconds (60:59).
7
8
4.4 Thermocouple Offset Adjustment
The offset adjustment allows an individual thermocouple to be optimised for the best
measurement accuracy at a chosen reference temperature.
Press
W
MIN
MAX
AVG
or
°
C
°
F
W
to select the required thermocouple channel and it will flash on the LCD
when selected.
Press
W
HOLD
or
REC
W
to increase/decrease the values.
The offset adjustment span is ± 5°C or ± 9°F
4.5 Setting the Alarm Limits (T1 only)
Press
W
HOLD
or
REC
W
to switch ON or OFF.
When setting the alarm point, select ON and then press
MEM
W
to set the
Hi
and
Lo
limit.
Note:
If the alarm limits are exceeded, the LCD will flash
ALARM
Hi
or
ALARM
Lo
and the audible
sounder will beep continuously.
The
Lo
alarm setting cannot be greater than the
Hi
alarm setting.
9
4.6 Set T1-T2 Differential mode
Press the
W
HOLD
or
REC
W
buttons to switch the differential mode ON or OFF.
Note:
When the T1-T2 differential mode is ON, the T1-T2 measurement will be displayed at the
bottom of the LCD.
4.7 Set Auto Power Off Time
Press
W
HOLD
or
REC
W
to switch the auto power off function ON or OFF. The function is OFF when
no time is selected.
The following auto power off times can be selected - 10 or 30 minutes, 1, 2, 4, or 8 hours. The
ON symbol will appear above the selected time.
4.8 Set System Clock
The DTL84 has a built in clock so that the data logger function can also record the date and time
as well as the measured value.
Press
W
MIN
MAX
AVG
or
°
C
°
F
W
to select the year, date and time.
Press
W
HOLD
or
REC
W
to increase/decrease the values.
Note:
It is advisable to check the system clock settings after replacing the batteries. If
necessary, reset the clock settings.
4
.9 Clearing Data Logger Records
Switch off the DTL84. Press and hold
REC
W
and then press
to power up the meter. Keep
holding both buttons and
REC, CLr
,
SUrE
, and 5 will appear on the LCD. Continue to hold both
buttons until 5 counts down to 0. To abort clearing the memory release both buttons before
the DTL84 counts down to 0. After the memory has been cleared the DTL84 will return to
measurement mode.
