7 Sensors
12
HELENOS V
7.2
Magnetic Pickup IA ...
7.2.1
Technical Datas
Operating principle
inductive sensor
Distance from sensing gear
standard 0.5 to 0.8 mm
with IA 22.. and IA 23.. 2.5 to 3 mm
Output
0 V .. 10 V AC
Signal form
Sine (depending on tooth shape)
Resistance
approx. 52 Ohm, with IA 22.. and IA 23..
approx. 130 Ohm
Temperature range
-55°C up to +125°C
Protection grade
IP 55
Vibration
< 10g, 10 .. 100 Hz
Shock
< 50g, 11 ms half sine wave
Corresponding plug
SV 6 - IA - 2K (EDV- No.: 010-02-170-00)
7.2.2
Installation
The installation of the pickup has to be arranged in such a way as to obtain a frequency
as high as possible. Normally, the HEINZMANN digital governors DG 16.1 - 03 up to
DG 40.1 - 03 are designed for a maximum frequency of 6.000 Hz. The frequency (by
Hz) is calculated according to the formula:
f (Hz) =
60
*
min)
/
1
(
z
n
z
=
number of teeth on the pickup wheel
Example:
n
=
500
z
=
80
f
=
60
80
*
500
= 666.67 Hz
It should be taken care that the speed can be measured by the pulse pickup without any
bias. For best results therefore, the speed pickup should take the engine speed from the
crankshaft. A suitable position for this is, e.g., the starter gear (but not the injection
pump wheel).
The pickup gear must consist of magnetic material (e.g., steel, cast iron).
