AFRISO PulsFox PMG 20 Technical manual

Version: 04.2021.0
ID: 900.100.0990
Lindenstraße20
74363Güglingen
Phone[phone]
Service+497135102-211
Telefax+497135102-147
[e-mail]
www.afriso.com
Copyright 2021 AFRISO-EURO-INDEX GmbH. All rights reserved.
0123
Operation
instrucions
Guided micropulse level indicator
PulsFox®
Typ: PMG 20

1 . About these operating instructions ........................................................................................4
2 . Information on safety ...............................................................................................................4
3 . Transport and storage .............................................................................................................6
4 . Product description .................................................................................................................6
5 . Variants of sensors ..................................................................................................................6
6 . Dimensional drawings .............................................................................................................8
7 . Mounting ...................................................................................................................................10
8 . Electrical connection ...............................................................................................................19
9 . Operating elements ..................................................................................................................22
10 . Basic settings .........................................................................................................................23
11 . HART®communikation protocol ............................................................................................31
12 . Modbus® protocol .................................................................................................................32
13 . Installation of custom measuring electrode, exchange or shortening of the measuring
electrode.........................................................................................................................................32
14 . Status and error signaling .....................................................................................................34
15 . Ordering data ..........................................................................................................................35
18 . Examples of correct name ....................................................................................................36
16 . Accessories ............................................................................................................................36
17 . Safety, Protections, Compatibility and Explosion safety ...................................................36
19 . Use, operation and maintenance ..........................................................................................37
20 . Warranty ..................................................................................................................................37
21 . Returning the device ..............................................................................................................37
22 . Indications on the nameplate ................................................................................................38
23 . Technical Parameter ..............................................................................................................39
24 . Menu structure .......................................................................................................................45
CONTENTS

PulsFox® PMG 20 AFRISO
4
1 . About these operating instructions
These operating instructions describe the level meter PulsFox PMG 20 also referred to as "product"
in these operating instructions). These operating instructions are part of the product.
• You may only use the product if you have fully read and understood these operating instructions.
• Verify that these operating instructions are always accessible for any type of work performed on
or with the product.
• Pass these operating instructions as well as all other product-related documents on to all ow-
ners of the product.
• If you feel that these operating instructions contain errors, inconsistencies, ambiguities or other
issues, contact the manufacturer prior to using the product..
These operating instructions are protected by copyright and may only be used as provided for by the
corresponding copyright legislation. We reserve the right to modications.
The manufacturer shall not be liable in any form whatsoever for direct or consequential damage
resulting from failure to observe these operating instructions or from failure to comply with directives,
regulations and standards and any other statutory requirements applicable at the installation site of
the product.
2 . Information on safety
2 .1 . Safety messages and hazard categories
These operating instructions contain safety messages to alert you to potential hazards and risks. In
addition to the instructions provided in these operating instructions, you must comply with all direc-
tives, standards and safety regulations applicable at the installation site of the product. Verify that
you are familiar with all directives, standards and safety regulations and ensure compliance with
them prior to using the product.
Safety messages in these operating instructions are highlighted with warning symbols and warning
words. Depending on the severity of a hazard, the safety messages are classied according to dif-
ferent hazard categories.
DANGER
DANGER indicates a hazardous situation, which, if not avoided, will result in death or se-
rious injury.
NOTICE
NOTICE indicates a hazardous situation, which, if not avoided, can result in equipment
damage.
In addition, the following symbols are used in these operating instructions:
This is the general safety alert symbol. It alerts to injury hazards or equipment
damage. Comply with all safety instructions in conjunction with this symbol to
help avoid possible death, injury or equipment damage..
This symbol alerts to hazardous electrical voltage. If this symbol is used in a
safety message, there is a hazard of electric shock.
This symbol alerts to general information.

5
AFRISO PulsFox® PMG 20
2 .2 . Intended use
This product may be used for level measureing of:
• Liquids
• Bulk solids
• Pasty substances
Any use other than the application explicitly permitted in these operating instructions is not permitted
and causes hazards.
Verify that the product is suitable for the application planned by you prior to using the product. In
doing so, take into account at least the following:
• All directives, standards and safety regulations applicable at the installation site of the product
• All conditions and data specied for the product
• The conditions of the planned application
In addition, perform a risk assessment in view of the planned application, according to an approved
risk assessment method, and implement the appropriate safety measures, based on the results of
the risk assessment. Take into account the consequences of installing or integrating the product into
a system or a plant.
When using the product, perform all work and all other activities in conjunction with the product in
compliance with the conditions specied in the operating instructions and on the nameplate, as well
as with all directives, standards and safety regulations applicable at the installation site of the prod-
uct.
2 .3 . Predictable incorrect application
The product must never be used in the following cases and for the following purposes:
• As part of an overll protection system according to WHG
• In aggressive liquids
2 .4 . Qualification of personnel
Only appropriately trained persons who are familiar with and understand the contents of these op-
erating instructions and all other pertinent product documentation are authorized to mount, commis-
sion, maintain and decommission this product.
These persons must have su󰀩cient technical training, knowledge and experience and be able to
foresee and detect potential hazards that may be caused by using the product.
All persons working on and with the product must be fully familiar with all directives, standards and
safety regulations that must be observed for performing such work.
2 .5 . Personal protective equipment
Always wear the required personal protective equipment. When performing work on and with the
product, take into account that hazards may be present at the installation site which do not directly
result from the product itself.
2 .6 . Modifications to the product
Only perform work on and with the product which is explicitly described in these operating instruc-
tions. Do not make any modications to the product which are not described in these operating
instructions.

PulsFox® PMG 20 AFRISO
6
3 . Transport and storage
The product may be damaged as a result of improper transport or storage..
NOTICE
INCORRECT HANDLING
• Verify compliance with the specied ambient conditions during transport or storage of the pro-
duct.
• Use the original packaging when transporting the product.
• Store the product in a clean and dry environment.
• Verify that the product is protected against shocks and impact during transport and storage.
Failure to follow these instructions can result in equipment damage.
4 . Product description
4 .1 . Measuring principle
The product works according to the TDR measuring principle (TDR-Time Domain Reectometry). The
pulse propagates along the electrode in the form of electromagnetic wave toward the level part of
electromagnetic wave, where it is partly reected and the reected returned to the receiving module
of the electronic. The electronic measures the time of ight of electromagnetic wave and the current
(actual) distance to the level is calculated. Then based on the height of the level, the level meter cur-
rent output 4 ... 20 mA is set with the HART communications or an industrial RS-485 line with Modbus
RTU communications and the measured value is shown on the display.
5 . Variants of sensors
• PulsFox®
PMG 20-00
(MO)
• Without electrode, The electrode is to be manufactured by the custo-
mer (only version 20 or 60) and connected to the electrode holder
using the M8 screw connection.
• PulsFox®
PMG 20-20
(MS)
• Mono probe rigid without insulation, for level measurement of liquids
and bulk material (water, emulsions, oil, diesel, our, sand, granular
and more)
• Probe lengths 0,5 ... 8 m.
• PulsFox®
PMG 20-22
(MS)
• Mono probe rigid with PFA insulation, for level measurement of ag-
gressive and high-purity liquids. Resistant to hot steam.
• Probe lengths 0,5 ... 2 m
• PulsFox® PMG
20-23 (MS)
• Mono probe rigid with FEP insulation, for level measurement of ag-
gressive liquids and beverages.
• Probe lengths 0,5 ... 2 m
• PulsFox® PMG
20-21 (MS)
• Mono probe with partially insulated probe (FEP), for level measu-
rement of liquids in areas where there is a risk of vapor condensation
on the electrode.
• Probe lengths 0,5 ... 8 m.

7
AFRISO PulsFox® PMG 20
• PulsFox® PMG
20-40 (KX)
• Mono probe rigid without insulation with referenz pipe, for accurate
measurement of liquid level in narrow spaces.
• Probe lengths 0,5 ... 3 m.
• PulsFox® PMG
20-60 (MF)
• Mono probe exible, without insulation, with weight Ø 30 mm, for
level measurement of liquids and non-sticking bulk materials (water,
cereals, grains, sand, etc.) in deeper tanks and silos.
• Probe lengths 1 ... 40 m.
• PulsFox® PMG
20-61 (MF)
• Mono probe exible, without insulation, with weight Ø 30 mm, rope
electrode (FEP Teon®) and coated weight (PTFE) , for level measure-
ment of aggressive liquids and very pure liquids.
• Probe lengths 1 ... 12 m.
• PulsFox® PMG
20-62 (MF
• Mono probe exible, without insulation, with mounting eye, for level
measurement of bulk solid materials (grains, our, cement, etc.) in
higher silos, vessels.
• Probe lengths 1 ... 40 m.
• PulsFox® PMG
20-63 (MF)
• Mono probe exible, with PA insulation and mounting eye (not insu-
lated), for level measurement of liquids and adhesive bulk solids (our,
cement, etc.).
• Probe lengths 1 ... 40 m.
• PulsFox® PMG
20 HTD
• without local display.
• PulsFox® PMG
20 HTO
• without local display

PulsFox® PMG 20 AFRISO
8
PMG 20-40
PMG 20-00
PMG 20-21
6 . Dimensional drawings
Process connection
TriClamp 1"
PMG 20-20
Electrode
holder
Electrode
PMG 20-22 (23)
4x Öffnung

9
AFRISO PulsFox® PMG 20
PMG 20-60 (62, 63) High temperature version
PMG 20 HTD (HTO)
PMG 20-61
Mounting eye
PMG 20-62 (MF)
PMG 20 version with connection
for protective hose

PulsFox® PMG 20 AFRISO
10
BASIC INFORMATION VALID FOR: all types
E = m + t + k
Fig. 1: Level meter
installation with the rod
electrode
E = m + t + k
Fig. 2: Level meter
installation with the rope
electrode
E – The length electrode
t – Maximum measuring range
m – Dead zone on the beginning of electrode
k – Dead zone on the end of electrode or the length of weight
(110 mm) at the rope
d – The distance from the tank wall (see. Tab. above)
h – The distance from the bottom (see. Tab. above)
• Install the level meter into the upper lid of the tank or reservoir using a welding ange or fas-
tening nut.
• Minimum distances to install the level meter into a lid or a ceiling of a tank from the tank wall is
given in table below.
• Otherwise, the level meter install as far as possible from the walls, to the middle between the
wall and the vertical inlet, see Fig. 1 and 2.
7 . Mounting
• This is an area in which the continual measurement of the level is being performed. The maxi-
mum measuring range is determined by the length of the measuring electrode with subtraction
of the dead zones at the beginning and end of the electrode, see g. 1 and 2. This range is also
the default setting of the level meter. The maximum measuring range can be reduced either
automatically when sensitivity is increased, see the table on the second page, or manually by
the user by changing the minimum and maximum level in the case of obstacles near of the end
or particularly of the beginning of the measuring electrode.
• In the event that the measured level is outside the measuring range, the level meter (for the cur-
rent version I) will go into failure mode and the output current will have a value that is set by the
user (the default value for failure mode is 4 mA). On Modbus version M, the relevant measure-
ment status bits on register 104 are activated, see the PMG 20Modbus RTU commands.
Distance to the wall
Wall type
d
(without reference
tube)
d
(with reference tube)
Metallic ≥ 300 mm1) any distance
Non-metallic ≥ 500 mm1) any distance
1) it is recommended that a smaller distance from a wall is consulted with the
manufacturer
Distance to the bottom
Type of elec-
trode h
rod
(no anchoring)
≥ 100 mm²) (length of electrode to 2 m)
≥ 150 mm²) (length of electrode over 2 m)
rope
(no anchoring)
≥ 100 mm²) (length of electrode to 10000 mm)
≥ 150 mm²) (length of electrode over 10000 mm)
2) In case of a sloping bottom the distance "h" should be twice as long.
Measurement range VALID FOR: all types

11
AFRISO PulsFox® PMG 20
• In connection with the measurement principle, it is not possible to evaluate electromagnetic wa-
ves deected in the area directly below the level meter and also at the end of the electrode (see
g. 3 and 4) These zones determine either the minimum distance between the level meter and
the highest possible level (parameter "m"), or the minimum distance at the end of the electrode
(parameter "k"). The level meter must be installed so that when the tank is lled to the maximum
and minimum possible level, the surface level is not in the dead zones. In the event that the
measured level enters the dead zone, i.e. goes beyond the measuring range, the level meter will
enter failure mode, see paragraph Measuring range.
• The size of the dead zone is inuenced by the set measurement sensitivity. The minimum dis-
tance to the medium (dead zones) is provided in the tables below.
Fig. 3: Dead zone with rod electrode Fig. 4: Dead zone with rope electrode
• The product must be installed below the ller neck
(see Fig. 5). The following applies here: the largest
possible nozzle diameter, the smallest possible nozzle
height.
Fig. 5: Installation in the ller neck
a ≤ b
b ≥ 50 mm
a – neck heigh
b – neck width
When installing the level meter into an input neck,
use the TEACHING procedure (see chapter Basic
settings). This will put the sensor into a mode that
suppresses false reections.
Dead zone VALID FOR: all types
Dead zone in relation to the preset measuring sensitivity
Measuring sensitivity m k (rod electrode) k (rope electrode)
low, medium, custom (1–4) 100 mm 0 mm 110 mm
high,, custom (5) 150 mm 50 mm 110 mm
custom (6, 7) 200 mm 50 mm 110 mm
custom (8) 250 mm 50 mm 110 mm
Filler neck VALID FOR: all types except PMG 20-40

PulsFox® PMG 20 AFRISO
12
• The end of the socket or the welding
ange must not have an extension
into the tank in Fig. 6.
• When installing the level meter into the roof of a concrete silo, the level meter installation hole b
must be larger than the thickness of the concrete a, see g. 8.
• In the event that the thickness of the concrete is greater than the diameter of the hole, it is
necessary to install the level meter into a countersink, see g. 9.
a< b
• To install the level meter in a
non-metallic water tank, it is neces-
sary to insert a metal plate with a
diameter greater than 200 mm in
the area of the process connection,
see g. 7. The metal plate must be
in contact with the thread stop of the
level meter.
Fig. 6: Incorrect welding ange mounting
to the tank
Fig. 7: Installationin non-metal tank
Fig. 8: Installation on the roof of the concrete
silo
Fig. 9: Installation in the ceiling inlet of a concrete
silo
Non-Metal tank VALID FOR: all types except PMG 20-40
Concrete silo PMG 20_-60, 61, 62, 63

13
AFRISO PulsFox® PMG 20
• Do not install the product above or into the ll stream. Turbulence and cones of material can
lead to measurement errors or measurement failure.
s – Radius of protective zone
along the electrode level meter
s = 300 mm
• The electromagnetically guided wave,
sent through the product, creates
an electromagnetic eld along the
electrode. Objects in the vicinity of the
electrode disturb this eld and thereby
inuence the measurement. Therefore,
a protection zone was dened along
the electrode with a diameter of 300
mm. Install the product in the tank at
a su󰀩cient distance from obstacles
(partition walls, climbing aids, agitator
...), see g. 12.
• The product must not be installed
in locations with direct sunlight
and must be protected from the
elements. Use suitable weather
protection for outdoor installations
(Fig. 10).
Fig. 10: Weather protection against direct sunlight
Level meter protection VALID FOR: all types
Outside the lling stream VALID FOR: all types
Obstacles in the tank VALID FOR: all types except PMG 20-40
Fig. 11: Installation outside the lling stream
Fig. 12: Installation outside obstacles in the tank

PulsFox® PMG 20 AFRISO
14
• If still these objects intervene into
the protective zone of the level me-
ter, it is necessary to create a map
of false reections by activating the
"TEACHING" mode (p. 25). In case
of installed mixers, it is necessary
to position the mixers near the level
meter (turning the mixer blade to the
proximity of the electrode). Items
inside the tank must not be from
the electrode distance of less than
100 mm, because a interference of
electromagnetic eld is very strong
in this zone and "TEACHING" mode
can not be used.
n = 100 mm
Fig. 13: Wrong installation close to obstacles
n – minimal distance of
objects from the electrode
from level meter
• For the type of level meter with
reference tube electromagnetic
guided wave propagates inside the
reference tube. This wave is not
a󰀨ected by the ambient environ-
ment. So for this type of radar is not
intended protective zone around
the electrodes and the level meter
can be used for measurements in
cramped spaces.
• The cable must be led under the
cable gland (sagging diagonally
downwards), g. 15.
• Tighten the cable gland and the top
cover su󰀩ciently to prevent mois-
ture from entering.
Fig. 14: Installation with reference tube in cramped
spaces
Fig. 15: Prevention to avoid intrusion of humidity
through cable gland
Cramped spaces PMG 20-40
Humidity VALID FOR: all types

15
AFRISO PulsFox® PMG 20
• Type of level meter without electro-
de is supplied without an electro-
de. It is therefore necessary to a
customer to mount his own made
measuring electrode. The diameter
of the electrode must be between
8-10 mm. For a connection it is
necessary that on the electrode is
made M8 thread. The connection
procedure is given in chap. 12,
page 26.
• Deposits, layers and sediments on the electrode may distort measurement and reduce the
permeability of the electromagnetic wave propagated along the electrode.
For level meter PMG 20-00 the manufacturer is not responsible for failures related to the
mounted measuring electrode!
• For installation of the level meter
with rope electrode into deep tanks
and silos the length of the electrode
must be selected so that the weight
will be below the minimum measu-
red level, see Fig. 16.
• The distance the electrode from the
tank wall must be at least 300 mm.
Otherwise, the level meter install
as far as possible from the walls,
to the middle between the wall and
the vertical inlet, see Fig. 16. It must
be ensured that the rope electrode
could not touch the vessel wall cau-
sed by the motion of the medium.
• Ensure that the maximum tensile
load on the rope of the electrode is
not exceeded. Its value is specied
in chapter "Technical parameters".
A large load could result in the rope
tearing. The tensile load depends
on the height and shape of the tank,
the thickness and adhesion of the
measured medium and the tank
emptying speed.
E = m + t + k
Fig. 16: Installation with rod electrode
Deep tanks and silos PMG 20_-60, 61, 62, 63
Deposit on the electrode VALID FOR: all types
Variant without electrode PMG 20-00
E – length of rope electrode
t – Measuring range
m – Dead zon
k – lengt of weight (110 mm)
d – Distance to wall min. 300 mm
h – Distance to ground (see table on page 7)
Fig. 17: Level meter without electrode

PulsFox® PMG 20 AFRISO
16
Fig. 18: Recommended Level meter
installation with anchorage
Anchoring the rope electrode PMG 20-62
• At the bottom of the tank (silo), it is
necessary to install an anchoring
point (by welding or drilling an an-
choring ring), to connect to the ring
at the end of the electrode.
• This anchoring is recommended for
applications with liquids, where tur-
bulences occur or media is stirred,
or for applications with bulk solids in
small and medium sized silos (up to
10 m height).
Rope electrode level meter
must untangle and then can
be inserted into the tank.

17
AFRISO PulsFox® PMG 20
Anchoring the rope electrode
without weight, anchored with
clamps
PMG 20_-60, 63
• At the bottom of the tank (silo), it is necessary to
install an anchoring point (by welding or drilling
an anchoring ring), to pull the rope through and
then attached with at least 2 clamps (3 clamps
are recommended for deep silos over 20 m). The
proposed length of the rope "E" must be longer
than the depth of the tank (silo) by adding the
length necessary to bend the rope and the part to
be pulled through the anchoring ring.
• For applications with bulk solids it is appropriate to
anchor the rope electrodes at the opposite sides
of the tank (silo) so that the rope is sagging, see
Fig.20. Minimum recommended sag is p = H/100
[mm]. This installation increases the resistance of
the rope to tension load.
• Minimum recommended distance of the sensor
from the wall is d = 1000 + H/50 [mm]
• If the ratio of silo width to depth is determined by
formula: r ≥ 1000 + H/20 [mm], the rope can be
anchored also on the same side of the silo, see
Fig 19.
d
r
p
H
d
r
p
H



mm 200 50h
E
3
2
m
E
4
3
p
E
3
4
s
E
3
1
E
10
1
a
20
E
40 b
20
H
000 1 r
50
H
000 1 d
100
H
p









mm
mm
mm




mm 200 50h
E
3
2
m
E
4
3
p
E
3
4
s
E
3
1
E
10
1
a
20
E
40 b
20
H
000 1 r
50
H
000 1 d
100
H
p









mm
mm
mm

Anchoring mathods depending
on the silo size
Anchoring method [mm]
opposite side of the silo
(Fig. 20) any
same side of silo (Fig.
19) ≥ 1000 + H/20
H – depth of the silo (from rope start to anchor)
p – rope sag (see formula above)
r – radius of the silo
d – distance to wall (see formula above)
Fig. 19: Recommended installation o the product with
anchoring on the same side of the silo
Fig. 20: Recommended installation o the product
with anchoring on the opposite side of the silo

PulsFox® PMG 20 AFRISO
18
• Recommended for rod electrodes
longer than 3 m.
• The end of the measuring electrode
may be installed in a short tube welded
to the bottom of the tank. At the bottom
part of the anchoring tube, it is recom-
mended to have a media overow hole.
The diameter of the tube should ensure
permanent contact of the tube walls
with the electrode.
Width of the electrodes
electrode type d
without insulation 8 mm
fully insulated 10 mm
Anchoring the rod electrode PMG 20_-20, 22, 23, 21
Fig. 21: Recommended installation with
anchoring of the rod electrode

19
AFRISO PulsFox® PMG 20
DANGER
ELECTRIC SHOCK
• Verify that the degree of protection against electric shock (protection class, double insulation) is
not reduced by the type of electrical installation.
Failure to follow these instructions will result in death or serious injury.
DANGER
ELECTRIC SHOCK CAUSED BY LIVE PARTS
• Disconnect the mains voltage supply before performing the work and ensure that it cannot be
switched on.
• Verify that no hazards can be caused by electrically conductive objects or media.
Failure to follow these instructions will result in death or serious injury.
The product is connected to the downstream device (evaluation device) with a standard two-core
cable (2 x 0.5 ... 0.75 mm²) without shielding.
1. Use 2pc. 2 × 0,25 mm² (twisted double-circuit line, shielded) for versions with Modbus communica-
tion.
If the product is connected to the RS-485 line as a terminal device with Modbus communication, the
installation of a terminating resistor 120 Ω is recommended. Set the lever labeled 120 Ω to the ON
position.
Terminating resistors are not connected for products that are connected to the RS-485 line as conti-
nuous devices, see g 23.
Connect cable to the product
1. Unscrew the nut of the upper transparent lid.
2. Take the upper edge of the display module and take it out carefully by mild swinging up.
- If you cannot grasp the module, you can use a small screwdriver. Insert it as far as the
seam and use from several sides to slightly lift the module.
3. Loosen the cable gland andl ead the cable through the cable through the cable gland under the
display module. Connect the phase to the + terminal and the neutral conductor to the - terminal.
4. In the case of shielded cables, connect the shield to the ground terminal.
5. Connect communication lines A and B of the RS-485 line (for version "M" - Modbus) to terminals
A and B.
6. Tighten the terminals and the cable gland
- For tightening torque, see technical parameters p. 32.
7. Insert the display module back into the head so that the connector is properly connected.
8. Slide silicone seal on the thread of the level meter body.
9. Tighten the nut of the upper lid
Connect the cable to downstream devices.
8 . Electrical connection

PulsFox® PMG 20 AFRISO
20
display unit connector
Terminal block
metal clip
-
+
+U
M
0V
A
B
A
B
+ABIS
GND
ON
120
display unit connector
Terminal block
metal clip
120 Ω switch
DANGER
ELECTROSTATIC DISCHARGE
Due to the possible occurrence of an electrostatic charge on the non-conductive parts of
the sensor, it is necessary to ground all sensors intended for use in environments with an
explosion hazard PMG 20 D-EX (HTD- EX) and PMG 20 D-EX (HTD- EX). This can be per-
formed by grounding el. conductive tanks or el. conductive tank lids, and in the case of el.
non-conductive tanks using and grounding an auxiliary plate electrode PDE-27.In the event
that the sensor is installed in an outdoor environment at a distance greater than 20 m from
the outdoor switchboard, or from an enclosed building, it is necessary to supplement the
electrical cable leading to the sensor with suitable overvoltage protection..
DANGER
ELECTRIC SHOCK
In the event of strong ambient electromagnetic interference, paralleling of conductors with
power distribution, or for distribution to distances over 30 m, we recommend grounding
the level meter (see above) and using a shielded cable. Ground the shielding of the cable
on the side of the power supply, or the shielding is possible to connect only on inside pin
of the level meter marked see g. 20 and 22 (shielding of the cable is always connected in
a single location).
The source of the power voltage must comprise of a stabilised safe low power source with galvanic
separation. In the event that a switch-mode power supply is used, it is essential that its constructi-
on e󰀨ectively suppresses common mode interference on the secondary side. In the event that the
switch-mode power supply is equipped with a PE safety terminal, it must be unconditionally grounded!
Spark-safe devices type PMG 20 D-EX (HTD- EX) must be powered from a spark-safe power source
meeting the above-mentioned requirements.
Fig. 22: Wiring diagram of the level meter with
current output PMG 20_-_-_-I
Fig. 24: Wiring diagram of the level meter with
Modbus PMG 20_-_-_-M
Fig. 23: Inside view of screw terminals of the level meter
with current output PMG 20_-_-_-I
Fig. 25: Inside view of screw terminals of the level meter
with Modbus PMG 20_-_-_-M