EN

ProGap
Microwave barrier
Operating Instructions

SWR engineering Messtechnik GmbH

Operating instructions

CONTENTS Page

1. General Comment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Mounting and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3. Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4. Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

5. Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6. Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

7. Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

8. Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

9. Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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Operating instructions

1. General Comment
The radar barrier is a contactless measuring method and can be used for metallic as well as non-metallic
ducts, bunkers, shafts, free-falling stretches, expansion bellows etc. Since it can penetrate non-conductive
material, e. g. such as plastics, it is possible to detect from the outside or through a window. The metering
thus can be completely decoupled from the process, e. g. for measuring aggressive, abrasive or bulky
material.

Even at difficult conditions - like temperatures of up to 1000 °C, pressure of up to 20 bar or all dust Ex-
zones - the ProGap can be used by means of a process adapter.

2. Mounting and Installation

The fitting position of the devices is arbitrary, however, absolute attention must be paid to the same fitting
position of transmitter and receiver (marking of each device at the top) and to the very exact justification to
each other (see below fig.).

Fig. 1: Installation

Transmitter and receiver must face each other with their front side on the same level.

Finally, it is important that the ProGap is mounted in a place where are no or only very weak vibrations.

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Operating instructions

To detect levels of materials with low bulk density respectively with a low dielectric coefficient reliably, the
installation of transmitter and receiver can be done as shown in the drawing below.
In this type of installation the metallic wall on the opposite side of the bin can be used for the reflection of
the microwave.
The arrangement of transmitter and receiver mustn’t be exactly parallel to each other in this installation,
because in that case the signal of the transmitter is not reflected to the receiver. The installation should be
slightly angled.
According to the rule arriving angle = emergent angle a slightly angled positioning, depending on the
distance to the opposite wall, is necessary.
The distance covered by the microwave in the shown installation is nearly twice as long as it is in a face to
face installation. The installation of the equipment on one side of the bin is also an advantage in case of
shortage of space.

Round Wall (metallic) Rectangular wall (metallic)

▲ ▲

▲ ▲

▲ ▲

▲ ▲

▲ ▲

▲ ▲
er

er
mitt

Rec
Rec

mitt
s
Tran

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er

3. Electrical Connection
The connection of the sensor has to be carried out according to below figures.

NC
NO
COM

Fig. 2: Transmitter Fig. 3: Receiver

For the 2-wired connection to the transmitter a current installation cable can be used.

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Operating instructions

4. Safety
The ProGap was designed, built and tested to be safe and was shipped in safe condition.
Nevertheless persons or objects may be endangered by components of the system if these are operated in an
inexpert manner. Therefore the operational instructions must be read completely and the safety notes must be
followed.
In case of inexpert or irregular use, the manufacturer will refuse any liability or guarantee.

4.1 Regular Use

•• Only original spare parts and accessories of SWR engineering must be used.

4.2 Identification of Dangers

•• In the manual it is pointed out to possible dangers with the use of the microwave barrier.

4.3 Operational Safety

•• The microwave barrier must be installed by trained and authorised personnel only.
•• In case of maintenance-work on the pipe or on components of the ProGap-sensor, make sure that the
piping is in unpressurized condition.
•• Switch off the supply voltage for all maintenance, cleaning or inspection works on the tubes.
•• Before sweat works the microwave barrier must be removed.
•• The components and electrical connections must be checked for damages regularly. If a damage is
found, it is to be repaired before further operation of the instruments.

4.4 Technical Progress

•• The manufacturer reserves the right to adapt technical data to the technical progress without particular
advance notice. If you have any questions, SWR engineering will be pleased to inform you on possible
changes and extensions of the operating instructions.

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Operating instructions

5. Commissioning
P1
Sensitivity fine
All necessary control elements for the alignment plug
are in the receiver. P2
Response time

P1: Adjustment of the sensitivity S1

Sensitivity rough
P2: Adjustment of the time delay of the ¤¤ ¤ ¤ ¤
LED red Power supply NC NO COM
signal. Field intensity

S1: Doubling of the sensitivity LED green

Switching status
(Pos. 1 = normal sensitivity and
Pos. 2 = double sensitivity
Fig. 4: Receiver
LED red: the flashing shows the signal intensity.
•• fast flashing = high signal intensity
•• slow flashing = low signal intensity
•• LED out = no signal received

LED green: indicates the switching status of the relay.

•• LED on = relay closed

Adjustment of the signal threshold with Potentiometer P1

With the potentiometer P1 the signal threshold can be adjusted, to that the relay should switch.
The microwave barrier is adjusted in such a way that clear distinctions between interrupted or damped
resp. not-interrupted microwave beam are made.

Proceeding: With not-interrupted beam and flashing red LED turn P1 against the clockwise to the relay
switches and at the same time the LED shines green. Now interrupt the beam path (put the material to
be detected between the transmitter and the receiver) and turn P1 only so far clockwise until the green
LED goes out. Repeat this procedure. If the green LED still lights, even with a complete left turn of P1, and
furthermore the material has a low dielectric constant and weak damping (e.g. paper, plastics, foams, etc.),
please contact SWR engineering GmbH

If the red LED should not light, put the switch S1 to position 2, with it the delicacy is doubled.
If the LED does not light even in this most sensitive position, then the receiver does not get any signal from
the transmitter. In this case examine the microwave barrier for faultless function by clarifying the following
possibilities:

•• Wrong adjustment of the barrier to each other

•• The distance between transmitter and receiver is too large
•• Too much damping material in the beam path
•• Damping built-up at the sensors

Adjusting of the switch response time Potentiometer P2

Finally adjust the switch response time with the potentiometer P2 according to your requirement between
the range of 0.25 and 5 seconds. By turning P2 anticlockwise, the delay increases. Thereby a fluttering of the
relay can be stopped, which have been produced by critical adjustment of the sensitivity.

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Operating instructions

6. Trouble Shooting
If the green LED should not light even in the most sensitive setting (potentiometer P1 turned completely to
the right and switch S1 on the position 2), when there is material between the transmitter and the receiver, it
could be possible that the maximal detecting range is limited due the following:

•• The position of the installation places to each other

•• The position of transmitter to receiver
•• The distance between transmitter and receiver is too large

7. Notice
•• Avoid reflections on metallic parts

8. Declaration of conformity
The called product agrees with the regulations of the following European directives:
Number: 89/336/EWG
Text: Electromagnetic Compatibility
The correspondence of the called product with the regulations of the directive No. 89/336/EWG is proved by
the entire observance of the following norms:

Ref. No. Date Ref. No. Date

DIN EN 55011 2007 DIN EN 61000-4-3 1997
DIN EN 61000-1 DIN EN 61000-6-1 2002
DIN EN 61000-3-2 2001 DIN EN 61000-6-2 2000
DIN EN 61000-3-3 2001 DIN EN 61000-6-3 2002

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Operating instructions

9. Technical Data
Material Housing: Stainless steel 1.4571
Sensor-Isolation: POM
Protective system IP 65; DustEx (optional)
Working temperature - 20 …+80 °C
(Process temperature) - 20 …+220 °C (with process-adapter)
Max. 1000 °C (with ceramic-flange)
Ambient temperature - 20 ... + 60 °C
Working pressure Max. 1 bar
Max. 20 bar (with process-adapter)
Detection range 0 ... 4 m
0 ... 18 m
> 18 m (on demand)
Power supply 24 V DC (-10 / +15 %)
24 V AC (-10 / +15 %)
Power consumption approx. 1.8 VA
Current consumption max. 100 mA
Relay output (max.)
•• voltage 120 V AC / DC
•• current 1.25 A
•• capacity 150 VA, 50 W
Response time 0.25 s ... 5 s (continuously adjustable)
Measuring frequency K-Band 24.125 GHz / ± 100 MHz
Transmitting power max. 5 mW
Weight Transmitter 1.1 kg
Receiver 1.1 kg

(All rights reserved.)

SWR engineering Messtechnik GmbH

Gutedelstraße 31 · 79418 Schliengen (Germany)
Fon +49 7635 82 72 48-0 · Fax +49 7635 82 72 48-48 · www.swr-engineering.com

EN 11/1/2014 8