Symbol Definition and Button Locations

MODEL 315 HUMIDITY TEMPERATURE METER

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

MODEL 315 HUMIDITY TEMPERATURE METER

	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

Data Hold indication

Minmum indication

Maximum indication

Low battery indication

Auto power off indication

Relative indication Humidity display

Unit indication

Temperature display

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.

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

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

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.

HUMIDITY

2	9V BATTERY
	NEDA 1604 6F22 006P

4MAX MIN

5HOLD