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1.3
Application characteristics
Speed sensors for applications such as turbines, compressors, expanders, etc. in hazardous
areas of zones 2. The sensors are approved as "non-sparking/non-incendive" equipment with
protection class Ex nA IIC, temperature class T4 (at Ta = -40 ° C to +125 ° C) or temperature
class T6 (at Ta = -20 ° C to + 40 ° C). The power supply must comply with the regulations for this
(see chapter 4.2 "Power supply" or Chapter0 "Safety instructions"). Safety classification up to
SIL 3 / IEC 61508:2010 resp. EN ISO 13849-1:2015 PL e Kat. 4, EN ISO 13849-2:2012 PL e
Kat. 4 and IEC 62061:2021; useable in applications up to SIL
Their low end of 0 Hz allows monitoring the machine down to zero speed. They are contact-free,
wear-free, maintenance-free and unsusceptible versus external magnetic stray fields and
machine vibration.
Sensors A5S1DD0...-n and A5S1DS0...-n for detection of rotational speed
Single Channel, the output provides the rotational speed as a single-track frequency signal.
Sensors A5S1DD3...-n and A5S1DS3...-n for detection of rotational speed and direction of
rotation
Dual Channel, 1 track = rotational speed as frequency, 1 track = F/R status as binary signal.
Sensors A5S1DD4...-n and A5S1DS4...-n for detection of rotational speed and direction of
rotation with two phase-shifted speed signals
Dual Channel, the output provides the rotational speed as a twin-track frequency signal (phase
shifted). Suitable for external direction detection with enhanced safety.
1.4
Mounting of the Sensor
The sensor should be mounted in radial direction so that it points to the axis of rotation of the
rotating profile. An arrangement parallel to the axis of rotation for frontal scanning is also
possible. Then, a possible axial displacement in the machine must be considered. All our
information applies to radial scanning.
For mounting, it is best to have the same thread in the fixed part. The sensor is then fixed in the
correct position with the supplied nut.
The mounting may be made flush in any material; several sensors can also be placed close to
each other.
A solid and vibration-free mounting of the sensor is important.
Adjustment to the profile edges
Mounting preferably in radial
direction and in alignment
with the profile
wrench planes at rear or front end
of sensor
Figure 1: Adjustment to the profile edges
profile
edge
rotation of
target
A5S1-n-Manual_EN_Rev03
3 as speed sensors.
CL
Slots for positioning with
NPT at rear end
2022_MAR_18
Page 6 of 42
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