Lufft SHM31 User Manual

Commissioning
Snow depth sensor SHM 31, V2.1 27
Hysteresis for window heating
[°C]
2.5
0 … 5
Switching point below (heating on) and
above (heating off) target temperature
Hysteresis for block heating [°C]
2.5
0 … 5
Switching point below (heating on) and
above (heating off) target temperature
Voltage threshold of heating [V]
17
12 … 19
If internal supply voltage exceeds this
value, heaters are operated in 24 V
mode instead of 12 V mode
Heating control via external
input
disabled
enabled, disabled
If enabled wire heating release (+)
needs to be connected to (+), see
section 6.5
Heater parameters for defrost mode
Target temperature of the
window heater defrost mode
[°C]
25
-50 … 50
The window heater will maintain the
selected temperature during defrost
mode
Target temperature of the block
heater defrost mode [°C]
35
-50 … 50
The block heater will maintain the
selected temperature during defrost
mode
Hold time for window defrost
[min.]
15
1 … 255
Select the duration of the window
defrost procedure
Hold time for block defrost
[min.]
15
1 … 255
Select the duration of the housing
defrost procedure
Automatic defrost after startup
no
n/y
...
Settings/Control
Standby
-
-
Not yet implemented
Auto start command
MST
MST, LON
Boot up mode for the sensor.
MST = starting measurements
LON = laser on
Scaling factor
1
0 … 40000
Change of units, e.g. meter (sf = 1) to
foot (sf = 3.2808399). After a change
of the scaling factor SCF the
parameters AOF, MSD and the
distance value in the telegram are
converted into the new units.
Channel average count
10
1 … 120
Number of measurements used to
calculate the values for averaged UMB
channels (*_avg) and the min/max
values
Justage
Reference height [mm]
0
-20000 … 20000
Will be automatically set during the
device calibration procedure
or can be set manually
Reference angle [°]
0
-180 … 180
Will be automatically set during the
device calibration procedure
or can be set manually
Algorithm parameters
Use accelerometer angle
0
0, 1
0 = use reference angle from
calibration, 1 = use the sensors
accelerometer value as reference
during each measurement
Signal threshold for snow
130
0 … 255
Sets the signal intensity as threshold
for the snow-flag
Maximum snow depth change
[mm]
20
-10000 … 10000
Maximum of allowed snow depth
changes between two measurements.

Lufft SHM31 Specifications

General

Brand	Lufft
Model	SHM31
Category	Accessories
Language	English