Vaisala HMP240 - Manual (Page 27)

HMP240 series
M210300en User's Guide
25
5.2 LED commands
NOTE
If the transmitter has a display/keypad cover, the LED
commands cannot be used.
LED commands can be used to operate the transmitter in the field. These
commands can be used in humidity and temperature calibration and calibration
of the analogue outputs.
Open the housing and press any one of the three press switches. The LEDs
will light up for 2 - 3 seconds.
OPENED COVER OF THE HMP 243
press switches
LEDs
UP
DOWN
ENT
Figure 5.1 Location of press switches and LEDs
Use the up and down switches (marked with arrows on the printed board) to
find the desired command code and acknowledge it with the ENT switch. The
command codes are (l = lit, ¡ = dark):
¡¡¡¡ (0)
return to normal state
¡¡¡l
(1) relative humidity calibration
¡¡l¡
(2) temperature calibration of the humidity sensor
head
¡l¡¡
(3) temperature calibration of the T sensor head
¡¡ll
(4) calibration of analogue outputs
l¡¡¡
(8) relative humidity calibration after sensor change