MODEL 315 HUMIDITY TEMPERATURE METER
Feature Locations:
1) Dust mask
2) LCD display
3) ON/OFF button
4) MAX MIN button
5) HOLD button
6) RELATIVE button
7) °C, °F control button
8) Battery cover
2
HUMIDITY:
TEMP:
4
6
7
5
3
2
F1404F
0%RH100
MIN
MAX
¢XF
C20
¢XC /
C60
REL
HOLD
8
1
HUMIDITY
OPEN
9V BAT
NEDA 1604 6F22 006P
TERY
Auto power off
indication
Temperature displa
y
Unit indication
Data Hold indication
Minmum indication
Low battery indication
Maximum indication
Relative indication
Humidity display
MODEL 315 HUMIDITY TEMPERATURE METER
5
5.2 Humidity Calibration
1. Turn the unit off. Press and hold the HOLD and °C/°F buttons. While
these two buttons are pressed, turn the power on. Release all buttons
and all the segments on the display will blink.
2. Within 3 seconds of releasing these buttons, press the UREL button to
enter the calibration mode, or the instrument will revert to normal
operating mode.
3. Upon entering the calibration mode, ‘CAL1’ will appear on the second
display.
4. Place the probe in a stable 32.8% RH environment at 25°C and allow
the system to stabilize for 30 minutes. Press the MAX MIN button to
initiate calibration. A single long beep will indicate calibration is
complete, and the instrument will advance into the ‘CAL2’ mode, as
indicated on the second display.
5. Insert the probe in a stable 75.3% RH environment at 25°C and again
allow the system to stabilize for 30 minutes. Press the MAX MIN button
to initiate calibration. A single long beep will indicate calibration is
complete, and the instrument will revert to normal operating mode.
5.3 Restoring Factory Calibration
1. To restore factory default calibration values, turn the instrument off.
Press the HOLD and °C/°F buttons. While these two buttons are
pressed, turn the power on. Release all buttons and all the segments
on the display will blink.
2. Within 3 seconds of releasing these buttons, again press the HOLD
button to restore factory calibration values. A single long beep will
indicate restoration is complete.