Kobold DON-H05G User Manual

Operating Instructions

for

Oval Wheel Flowmeter

High pressure

Model:

DON-H...

DON-H

1. Contents

1. Contents ........................................................................................................ 2

2. Note .............................................................................................................. 3

3. Instrument Inspection .................................................................................... 3

4. Regulation Use ............................................................................................. 4

5. Operating Principle ........................................................................................ 4

6. Mechanical Connection ................................................................................. 5

6.1 General ................................................................................................ 5

6.2 Orientation ........................................................................................... 6

7. Electrical Connection .................................................................................... 8

7.1 Connecting Cable ................................................................................ 8

7.2 Electrical connection for integrated electronics options ....................... 8

7.3 Internal wiring with electronic options –Zx ......................................... 11

7.4 External wiring with electronic unit ZOK-Zx ....................................... 13

8. Commissioning............................................................................................ 15

9. Maintenance ............................................................................................... 16

9.1 Disassembly of DON-H with Pulse meter .......................................... 17

9.2 Demounting of the electronics mounted on a DON with Zx and 1A…5A

9.3 Spare Parts ........................................................................................ 19

9.4 Inspection (refer Exploded View) ....................................................... 19

9.5 Re-assembly of DON-H ..................................................................... 19

10.Technical Data ............................................................................................ 23

11.Pressure drop curves .................................................................................. 26

12.Order codes ................................................................................................ 27

13.Dimensions ................................................................................................. 28

14.Troubleshooting .......................................................................................... 29

15.Use in Ex areas ........................................................................................... 31

15.1 General information ........................................................................... 31

15.2 ATEX version Exi (electronics options xA) ......................................... 34

16.EU Declaration of Conformance ................................................................. 41

17.Statement of Conformity ............................................................................. 43

18.State of safeness ........................................................................................ 48

options ............................................................................................... 19

page 2

Manufactured and sold by:

KOBOLD Instruments Inc.

1801 Parkway View Drive

Pittsburgh PA 15205-1422

Tel.: [phone]

: 412-788-4980

Fax

E-Mail: [e-mail]

Internet: www.koboldusa.com

DON-H 01/0721

2. Note

Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
The devices are only to be used, maintained, and serviced by persons familiar
with these operating instructions and in accordance with local regulations
applying to Health & Safety and prevention of accidents.

When used in machines, the measuring unit should be used only when the
machines fulfil the EC-machine guidelines.

as per PED 2014/68/EU

In acc. with Article 4 Paragraph (3), "Sound Engineering Practice", of the PED
2014/68/EU no CE mark.

DON-H

Model DON-* DN

DON-05 ⅛ 400­DON-10 ¼ 400
DON-15 ¼ 400
DON-20 ½ 400

P

max

[bar]

Diagram8

Group1

dangerousfluids

§4 Abs.3 §4 Abs.3

Diagram9

Group2

nodangerousfluids

3. Instrument Inspection

Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.

Scope of delivery:

The standard delivery includes:

 Oval Wheel Flowmeter, High pressure model: DON-H...
 Operating Instructions

Each DON volume counter has been calibrated to function with mineral oil, which
means the remainder of the calibration oil still remains in the device.
The oil used is:
for measurement ranges H05 for high viscosities: SHELL Morlina 10
for measurement ranges H10 to H20: EXXSOL D120

DON-H 01/0721

page 3

DON-H

4. Regulation Use

The oval gear meter is a precise positive displacement flowmeter incorporating a
pair of oval geared rotors. These meters are capable of measuring the flow of a
broad range of clean liquids.

Stainless Steel flowmeters are suited to most water-based products and
chemicals and aluminium meters are suitable for fuels, fuel oils, & lubricating
liquids. It is important to ensure that the medium to be measured is compatible
with the materials used in the instrument (see section 10 “Technical Data”). It is
also imperative to comply with the maximum permissible operating parameters
specified in the “Technical Data” section.

The operation of the offered electronics (Zx, 1A…5A) is described in the separate
ZOK- (Ex) operating instructions.

Any use of the oval gear flow meter model: DON, which exceeds the
manufacturer’s specification, may invalidate its warranty. Therefore, any resulting
damage is not the responsibility of the manufacturer. The user assumes all risk
for such usage.

5. Operating Principle

Oval gear flowmeters are categorized as positive displacement flow technology.
When liquid flows through this type of positive displacement flowmeter, two oval
geared rotors measure a constant volume per rotation within a precisely
machined measuring chamber. With each rotation, a constant volume of liquid is
measured. The rotation of the oval gears is sensed via magnets embedded within
the rotors. These magnets transmit a high-resolution pulse output. The output
signal can be process externally via a remote display controller or PLC or via a
variety of output/display options available as accessories attached to the
flowmeters.

The positive displacement flow technology allows for precise flow measurement
of most clean liquids regardless of the media conductivity. Other liquid properties
also have a minimal effect on the performance of this type of meter. Flow profile
conditioning is not required as with alternative flow technology options making
oval gear installations simple to install in tight spaces and at an economical price.

page 4

DON-H 01/0721

OPERATION:

Liquid travels around the crescent

d chambers created by the

shape
rotational movement of the rotors

liquid entering
measuring chamber

6. Mechanical Connection

DON-H

liquid exits the
measuring chamber

liquid in transit

6.1 General

Points to verify before meter installation:

 Chemical compatibility of the liquid. Be sure that all wetted parts are

identified and confirmed suitable for use with the media being measured. If
unsure, please contact a KOBOLD engineer for guidance in obtaining the
proper reference materials.

 Verify that the operational pressure and temperature limits are within

capability of the fully specified meter. Verify that the operational flow rates are
within the specified flow range. Viscous liquids may limit the maximum
allowable flow based on the viscosity. The max allowable flow rate may need
to be limited to ensure the differential pressure across the flowmeter does not
exceed 1 bar, (100 kPa, 15 PSIG).

 Be sure that the flowmeter is not subject to any process temperatures and/or

pressures that can cause the measured liquid to freeze or flash inside the
meter.

 the measuring instrument is not subjected to process temperatures and

pressures that convert the liquid medium into a gas inside the device.

DON-H 01/0721

page 5

DON-H

6.2 Orientation

When installing the flowmeter, orientation must be considered. The rotor shafts
must be in a horizontal plane. To verify that the rotor shafts are in a horizontal
plane, electronic cover or optional digital display will be facing in a horizontal
direction. For modification in the field, the electronic cover or digital display can
be rotated in any 90 degree position. This accommodates access to the electrical
entry and allows the electronic display orientation to best suit the installation.

C O R R E C T I N S T A L L A T I O N S

C O R R E C T I N S T A L L A T I O N S

I N C O R R E C T

Incorrect installations will cause the

rotor weight to be felt on the bottom of

the measuring cavity.

page 6

Note: orient the conduit entry downward
to avoid moisture migration into the
electronic cavity.

The DON flowmeter accommodates both horizontal and vertical flows. It is
recommended that for vertical flow installations that the liquid flow up through the

meter (i.e. bottom to top). This orientation assists in air or entrained gas removal.

The flow meter is bidirectional. To identify the flow direction, in which the
flowmeter was calibrated, the flowmeters are marked with arrows. These arrows
are placed on the lower side for models DON-H05 .. DON-H20. The flowmeter
calibration data refers to this arrow direction. This is also the preferred flow
direction.

DON-H 01/0721

DON-H

Flow Conditioning and installation location
Filter:
It is highly recommended to INSTALL a filter immediately before (prior to) the
meter. Filters are available and sold separately.

Recommended Filter:
DON-H05…DON-H15: < 75 µm particle size (200 mesh)
DON-H20: < 150 µm particle size (100 mesh)

Flow conditioning: Flow conditions are not required since the DON flowmeter
does not require any straight pipe runs before or after the flowmeter.

Location: The recommended installation would be before any flow control and/or
shut off valves, this installation prevents complete emptying of the meter. This
minimizes the risk of leakage and/or air entrapment which could result in damage
to the flowmeter or inaccurate initial readings.

A by-pass installation is recommended for process or safety critical meters.
Isolation valves enable the meter to be isolated from the system and serviced as
needed. System purging is also possible with a by-pass arrangement.
Accommodate all meter ratings and locate the meter on the discharge side of the
process pump.

For outdoor applications, be sure all electrical entries are sealed properly via the
proper glands, mounting, sealing or containment. For humid environments,
mount the instrument appropriately as to avoid condensation build up. Generally,
these installations have the conduit connection pointing downward as to drain any
condensate away from the electronics.

Liquid State: Liquid within the flowmeter must not freeze. If heat tracing is
necessary, please be sure to adhere to the temperature limits of the flow meter.
Ensure the liquid does not flash, do not exceed the max DP of the flowmeter.

Hydraulic shock: Surge dampeners or pressure relief valves must be installed if
hydraulic shock or pressure spikes are present. Highly pulsating flow can also
damage the DON flowmeter. Diaphragm pumps and specific application profiles
can cause high frequency pulsating flow. Pulsation dampeners are highly
recommended.

DON-H 01/0721

page 7

DON-H

7. Electrical Connection

7.1 Connecting Cable

Proper shielded instrument cable is highly recommended. Low capacitance
twisted pair 7 x 0.3 mm (0.5 mm²) for use with the DON and any remote receiving
instrumentation. Typical cable would be Belden® 9363 or similar. Connect the
cable shield to DC common or designated grounding terminal at the receiving
instrument. Remember to only connect the end of the cable shielding at the
receiving instrument (not the DON) to ensure proper interference protection.

Please be sure not to run the connecting cable within a common conduit or in
close proximity to conduit with high inductive loads or power sources. This could
result in noise or inducted errors to the output signal or result in damage to the
electronic components. Always run the instrument cables in a separate conduit or
within a common conduit with other low power cables. Max cable length should
be limited to 3280 ft (1000 m).

7.2 Electrical connection for integrated electronics options

The electrical connection of the integrated electronics options always requires the
electronics cover to be dismantled. High pressure models incorporate the cable
inlet into the electronics cover.
The connecting cable must be routed through the cable duct and connected in
accordance with 7.3.1 to 7.3.4. The connecting terminals are of the plug-in type,
and can be taken out of the terminal compartment to facilitate connection.

7.2.1 Hall-effect sensor with active pulse output (H0 option)

The H0 electronic option combines a hall-effect sensor with an active push-pull
output stage. A three-phase electrical connection is used. The output is actively
switched, either to the input terminal voltage +Vs or to GND. The external input
terminal voltage is 8 to 30 V
up resistor). The high signal corresponds approximately to the +Vs input terminal
voltage and the low signal approximately to 0 V.
The electrical load can be connected to either the input terminal voltage or GND

Max. output current (power source or sink): 100 mA (short-circuit protected).

. No additional external wiring is required (e.g. pull-

DC

page 8

DON-H 01/0721

DON-H

Note!
The electronic option H0 is available with reed switch output.

DON-H 01/0721

page 9

DON-H

7.2.2 Reed Switch Pulse Output (option H0/HA)

The DON reed switch output is a SPST potential free N/O 2-wire output. This is a
passive output so no power is required.

Average electrical endurance of switching contact (MTTF – Mean Time To First
Failure):
Max. switching voltage (30 V/10 mA) 5x105 switching cycles
Max. current load (20 V/10 mA) 5x106 switching cycles
Min. load (<5 V/10 mA) 5x108 switching cycles

Switching capacity: Max. 30 VDC, max. 20 mA

Note: when using the reed switch output the liquid temperature
must not change at a rate greater than 10 ºC per minute (50 ºF
per minute).

Lamp load with series or parallel Protection with a RC suppressor
resistance to the reed switch. For a.c. current and inductive load.

Protection with a diode Protection with an inductance or
for d.c. current and inductive load. Resistance for capacitive load.

page 10

The individually specified maximum electrical values of the reed switch must
never be exceeded, even for a moment. Higher switching values may reduce the
service life or even destroy the contact.
For capacitive and inductive loads (e.g. via long lines), we recommend the
following protective circuits:

DON-H 01/0721

DON-H

7.3 Internal wiring with electronic options –Zx

The -Zx electronic options are pre-configured ex works in connection with the
sensor boards. Reconfiguration is available on request.

7.3.1 For Z1/Z2/Z3/Z5 electronic options (reed switch and Hall sensor)

a) Wiring diagram with reed switch (ex works standard, mandatory

for supply with battery or in 2-wire 4-20 mA operation)

DON-H 01/0721

page 11

DON-H

b) Wiring diagram with Hall sensor (recommended in connection

with external supply)

7.3.2 For 1A…5A electronics options

See supplement to operating instructions ZOK-Ex for electronics options 1A… 5A

7.3.3 Calibration Factor (scale or K Factor)

The DON flowmeter is delivered with a factory calibration certificate. Within this
certificate, a calibration factor is provided. The calibration factor is a specific
representation of pulses per unit volume. (i.e. pulses per liter) for that specific
meter.
Measurement devices with attached electronics are factory pre-configured to the
corresponding calibration factor. Depending on the model, the calibration protocol
is based on either the flow rate display or the analog output.
For further details on the operation and parameterization of the electronic option
Zx and 1A…5A see operating instructions ZOK- (Ex).

page 12

DON-H 01/0721

7.4 External wiring with electronic unit ZOK-Zx

7.4.1 Wiring with ZOK-ZxK

a) Circuit with Hall sensor (not for battery operation)

DON-H

b) Circuit with Reed switch

DON-H 01/0721

page 13

DON-H

7.4.2 Wiring with ZOK-ZxP

a) Circuit with Hall sensor

b) Circuit with Reed switch

page 14

DON-H 01/0721

8. Commissioning

The piping MUST be flushed of debris before installation. Debris such as slag
from welding, grinding dust, rust, pipe tape or sealing compound are common
within new piping installations and will damage the flowmeter if not flushed or
filtered from the process piping before installation and operation.

A by-pass system is common for frequent system flushing or frequent meter
removal. If a by-pass system is not practical or possible, removal of the gears
before flushing is necessary. (refer to section 9.1 “Disassembly of Pulse meter”).

DON-H

For proper operation the flowmeter must be purged of air. During long periods of
inactivity or after a flushing, air may be in the piping. Elimination of the air may
be achieved by operating the meter at a low flow rate until all the air is eliminated.
Damage may occur to the flowmeter if it is run above the maximum rated flow
rate or if the maximum differential pressure of 15 psi (1 bar, 100 kPa) is
exceeded.

After mechanical and electrical installation according to the guidelines set forth
within this user manual, the DON flowmeter is ready for operation.

Warning!
Risk of damage by blocking of measuring mechanism.
A missing count signal may indicate a blocked measuring
mechanism. The resulting increase in pressure before the device
can lead to further damage to the unit and / or the plant. Remove
the unit or shut down the plant immediately, if an unplanned
absence of the counter signal takes place.
Eliminate the cause of the malfunction.

DON-H 01/0721

page 15

DON-H

9. Maintenance

Flowmeter maintenance precautions:

 Remove/disconnect power to the flowmeter.
 Ensure that flow supply to the meter is turned off and the system is not

under pressure.

 Completely drain the flowmeter
 Confirm that any signal output(s) will not affect the system when de-

energized or removed from the circuit.

Oval gear positive displacement flowmeters are mechanical by nature. A periodic
maintenance/inspection schedule is suggested for an extended service life.
Follow the guidelines within this user manual for the maximum flowmeter
performance.

The maintenance/inspection schedule should be determined based off of
application factors such as media type (abrasiveness, lubricity, and/or chemical
compatibility), flow rate, and operating/maximum temperature and pressure.

page 16

DON-H 01/0721

DON-H

9.1 Disassembly of DON-H with Pulse meter

Concerning option H0/HA

9.1.1 Pulse output board removal (refer exploded view diagram

To remove the pulse output board, remove the 4 electronic cover screws (10),
and remove the electronic cover (9). The pulse output board (6) can now be
accessed and removed via the removal of the electronic board screws (7).

9.1.2 Oval gear removal for DON-H05…DON-H10 (refer exploded view
diagram

For access to the oval gears, remove the 4 lower meter body screws (5). With
care, remove the upper meter body assembly (4) being careful not to damage or
misplace the O-ring (3). You can then remove the oval gears (2).
For the small flowmeters (4 mm & 6 mm), when disassembling, please notice
the dimples located on the meter body (1 & 4) face just outside the o-ring
groove. The referencing dimples must be in alignment when reassembling. In
addition, with the small flow meters, only one oval gear is equipped with
magnets. The oval gear without magnet must be mounted on the axle that
is closest to the dimple. With all other devices, both oval gears are equipped
with magnets and can be mounted in any position.

5

2

3

1

4

Assembly alignment

dimple

2

6

7

Optional

8

9

10

DON-H 01/0721

page 17

DON-H

9.1.3 Removal of oval gears for DON-H15...H20 (refer exploded view)

For access to the oval gears, remove the 8 or 10 upper meter body screws (5).
With care, remove the upper meter body assembly (4) being careful not to
damage or misplace the O-ring (3). You can then remove the oval gears (2).

DON-H15...

DON-H20...

Optional

page 18

Optional

DON-H 01/0721

DON-H

9.2 Demounting of the electronics mounted on a DON with Zx
and 1A…5A options

To access the
electronic cover with display must first be removed in case of flowmeters with
built-in electronics. To do this, loosen the 4 screws of the display cover and
carefully remove it without pulling out or damaging the connecting cable. During
this procedure, be careful not to lose or damage the O-ring. The
terminal connection, device battery and pulse output board are now freely
accessible. To remove the electronics, the screws used to connect the
electronics housing to the oval gearbox housing should be loosened.

device battery, terminal connections and pulse output board, the

9.3 Spare Parts

Please consult your closest KOBOLD-Office
Internet: www.koboldusa.com

9.4 Inspection (refer Exploded View)

Inspection points will be the following:

O-rings – Inspect for physical or chemical damage or deformation.
Rotors – Inspect for physical damage due to unfiltered media or damage due to

chemical attack. Also observe also the magnets, if exposed, for chemical attack.

Measuring Cavity – Inspect for physical damage (scoring) due to improperly

filtered media or long term wear and tear.

Axle Shafts – Inspect for physical damage and ensure that the shafts are not

loose and do not rotate.

9.5 Re-assembly of DON-H

Before re-assembly, please be sure to thoroughly clean all parts.

Care must be taken when reinstalling the rotors such that the magnets should
face the pulse output board.

DON-H 01/0721

page 19

DON-H

9.5.1 Re-assembly of DON-H05...DON-H10

The
(1 and 4). The referencing dimples must be in alignment when reassembling. In
addition, with these small flow meters, only one oval gear is equipped with
magnets. The oval gear without magnet must be mounted on the axle that
is closest to the dimple.
Both oval gears are correctly installed when they are at an angle of 90 ° to each
other. The oval gears must be able to rotate freely.
Check the correct fit and the friction between the axle and the bearings by
slowly rotating the oval gears by hand.

Thereafter, the O-ring (3) is inserted into the groove of the measuring housing (1)
and both parts (1 and 4) are reassembled. It must be ensured that the markings
are in alignment with each other.

The screws (5) are inserted and tightened crosswise opposite one another.
Tighten the screws with a torque of 3.5 Nm. The alternating tightening procedure
is preferred for proper and even assembly.

small flowmeters DON-H05 to DON-H10 have dimples on both housing parts

If necessary, the pulse output board, the cover with the cable gland or the
attached electronics are installed. Make sure that the O-ring (8) is seated
correctly.

Assembly alignment

dimple

1

2

8

5

6

9

10

2

3

4

7

page 20

Optional

DON-H 01/0721

DON-H

9.5.2 Re-assembly of DON-H15...DON-H20

Both oval gears are placed on the axle shafts with the magnets oriented towards
the upper meter body (4). Verify that the axle shafts are not loose. Both oval
gears are equipped with embedded magnets, allowing them to each be mounted
on either axle.
Install the rotors exactly perpendicular from each other (90° in orientation). They
will only work if installed precisely. Manually test full rotation after installation as
the rotors will not completely rotate freely unless installed precisely 90° from each
other.

Proper placement of the O-ring within the groove is necessary for leak free
operation. After placement, items (1 & 4) will then require assembly.

Tighten the upper meter body to the lower meter body (1 & 4) with the screws (5)
in an alternating pattern (1, 3, 2, 4). Tighten to each to a torque of 3.5 Nm. The
alternating tightening procedure is preferred for proper and even assembly.

Install the pulse detector board, the o-ring into the provided groove, and then
install either the electronic cover (9) or optional electronic assembly.

Exploded view of DON-H15...DON-H20

DON-H15...

DON-H 01/0721

optional

page 21

DON-H

A2

DON-H20...

Tightening torques of the screws used

Thread Quality Material Tightening torques

M5 80 A4 6 Nm
M6 80 A4 10 Nm
M6 12.9

M10 70

Optional

Steel

20 Nm
40 Nm

page 22

DON-H 01/0721

10. Technical Data

Material:

Body: stainl. Steel 1.4404 DON-H05...DON-H20
Oval wheels: stainl. Steel 1.4404 DON-H05...DON-H20
Bearing: carbon graphite
Axes: stainl. Steel 1.4404

DON-H

O-Rings: medi

Note: Choose appropriate sealing according to permissible temperature limits of
the flowmeter.

Cover for cable connection: polyamide PA6 GF35 UL94 HB/VO

Screws: coated steel, GEOMET® 321
Magnet cover: DON-H05, -H10: PEEK

Accuracy
(under reference conditions*): ± 1 % of reading (DON-H05...DON-H15)

Protection class: IP 66/67

a temperature: -20 °C…+80 °C for options Zx and

Medi

Ambient temperature: -20...+80 °C
Cable entry: M20x1.5, ½“ NPT

a temperature
FKM: -20...+150 °C
NBR: -20...+100 °C
FEP-O-seal: -15…+130 °C
(FEP-O-seal, FEP encased, with solid core
EPDM)
Fluoroprene® acc. to EN 1935

stainless steel 1.4404

DON-H15, -H20: stainless steel 1.4404

± 0.5 % of reading (DON-H20)
± 0.2 % of reading (DON-H20;
with optional Z3-electronics based on
linearization function

-20 °C…+120 °C with pulse output
and options Zx with cooling fins

ATEX approval

Mechanical explosion protection:

Options 1A/2A/3A/5A:
Intrinsic safety II 2G Ex ia IIC T4 Gb (-20 °C ≤Ta≤+60 °C)

Option HA:
Intrinsic safety II 3G Ex ic IIC T4/T3 Gc

* Reference conditions: -H05 (mineral oil 10 cSt, 20 °C, 5 bar)

DON-H 01/0721

II 2G Ex h IIC T4/T3 Gb

-H10…-H20 (calibration oil 4.6 cST, 25 °C, 1 bar)
Accuracy data is valid for given viscosities and higher

page 23

DON-H

(cP)

H0/HA electronics options: Supply voltage: 8 to 30 VDC

(Hall sensor + reed switch Supply current: max. 5 mA (without load)
pulse output) Hall pulse output: active push-pull, max.

proof

Electronics options Z1… Z5: see operating instructions ZOK-

Electronics options 1A… 5A: see operating instructions supplement ZOK-Ex

100 mA, short-circuit-

HIGH level:
Min. +Vs – 1.3 V
LOW level: max. 1.3 V

Reed switch pulse output:

max. switching voltage: 30 V
max. switching current: 20 mA
max. switching capacity: 0,6 W

DC

Maximum Pressure (threaded version)

DON-H05...-20: 400 bar

Max. Flowrate Multiplier (for higher viscosities)

Viscosities

≤ 1000 1 1
≤ 2000 0,5 1
≤ 4000 0,42 0,84
≤ 6000 0,33 0,66

≤ 8000 0,25 0,5
≤ 30000 0,15 0,3
≤ 60000 0,12 0,25

≤ 150000 0,1 0,2
≤ 250000 0,05 0,1

≤1000000 0,025 0,05

Special cut rotors for higher viscosities

For viscosity > 1000 cP, special c
be used to reduce pressure drop. This applies to DON-H15
and larger sizes. For higher viscosities, the flowmeter
max. flowrate is de-rated according to the attached chart.

Standard rotor Special cut rotor

ut rotors option „S“ should

page 24

Example: DON-H20 measuring oil at 8000 cP, max. flow
150 LPM x 0.5 = 75 LPM new maximum flow rate.

DON-H 01/0721

Output Pulse Resolution -H0/HA

–

2163

DON-H

Measuring

Model

DON-H05 0,5 - 36 L/h 2670 2670
DON-H06 2-36 L/h 2670 2670
DON-H10 2 - 100 L/h 1054 1054

DON-H15 15

DON-H20 1-40 8

range

[L/min]

550 L/h 355 710

Reedswitch Hall sensor

Pulse / litre

The values in above table are only approximate guidelines. The actual value for
pulse rate can deviate from the values

in this table and is mentioned in

calibration certificate delivered with the flowmeter.

DON-H 01/0721

page 25

DON-H

11. Pressure drop curves

page 26

Pressure d

The curves above represent the pressure drop for standard cut oval rotors.
Special cut rotors option "Y" have alternate tooth relieve which effectively
reduces the pressure drop by 50%. When sizing a meter, be sure your
selection falls below the 1 bar maximum allowable pressure drop line on

the graph.

rop limit versus flowrate

DON-H 01/0721

12. Order codes

Order Details (Example: DON-H10G N1 1 R0 M 0)

DON-H

Measuring

Range

0.13...9.5 GPH DON-H05G..

0.5...27 GPH DON-H10G..

4...145 GPH DON-H15G

Stainless Steel

2)

Housing

1)

Connection O-Ring Material Electronics Cable Entry Option

1

..N1.. =

..R1.. = G

..N2...=

..R2.. =

..N2.. =

..

..R2.. =

⁄8" NPT

1

⁄8

¼" NPT

G ¼

¼" NPT

G ¼

..1.. = FKM

..3.. = FEP-O-Ring

..4.. = NBR

..5.. = Fluoroprene

..N4.. =

..R4.. =

½" NPT

G ½

0.26...10.6 GPM DON-H20G

1) Replace Hxx with Sxx for special rotors for viscosities > 1000 cP

2) Replace 'G' with 'H' to order LPH (LPM) (e.g. 15 H instead of 15 G)

3) Only for electronic options ..Zx

4) E1/E2/E3/E5 = Z1/Z2/Z3/Z5 in ATEX version (Exi), without backlighting

1)

..

..9.. = Special

Materials
(not for
ATEX)

..H0.. = Hall Sensor (Push-Pull) /

Reed Switch, Pulse Output

..HA.. = H0 + ATEX (Exi)

..Z1.. = Dual LCD Totalizer

..Z2.. = Batching Unit LCD

..Z3.. = LCD Totalizer, Rate, Outputs:

4-4-20 mA, Alarm, Pul

®

(ZOK-Z3) (Impulses not for
Battery Supply)

..Z5.. = Z3 + 2 SPDT Relays

4)

..1A

.. = E1 + HA ATEX (Exi)
..2A4).. = E2 + HA ATEX (Exi)
..3A4).. = E3 + HA ATEX (Exi)
..5A4).. = E5 + HA ATEX (Exi)

..M = M20

..N = ½" NPT

3)

= M20 with

..S

Cooling
Fin

3)

= ½" NPT

..T

with
Cooling
Fin

..0 = without

..N = Without

Battery

..Y = Special

Option
(Specify in
Clear Text,
not for ATEX)

Example: DON-H10H R1 1 H0 M 0

Measuring

range

[l/min] Stainless

0.5 – 36 l/h DON-H05H

2 – 100 l/h DON-H10H1)

15 – 550 l/h DON-H15H1)

1 – 40 DON-H20H1)

1)

Replace Hxx with Sxx for special rotor for higher viscosities ˃ 1000 cP

3)

Only for electronic options -Zx 4) E1/E2/E3/E5 = Z1/Z2/Z3/Z5 in ATEX version (Exi), without backlighting

Housing

material

steel

2)

Connection

R1 = G ⅛
N1 = ⅛” NPT

R2 = G ¼
N2 = ¼“ NPT

R2 = G ¼
N2 = ¼“ NPT

R4 = G ½
N4 = ½“ NPT

O-ring

Material

1 = FKM
3 = FEP-

O-ring

4 = NBR
5 = Fluoroprene®
9 = Special

materials (not
for ATEX)

Electronics Cable entry Option

H0 = hall sensor (Push-Pull)/

reed switch, pulse output

HA = H0 + ATEX (Exi)
Z1 = dual LCD totalizer
Z2 = Dosing unit LCD
Z3 = LCD totalizer/rate,

outputs:

4-20 mA, alarm, pulse
(Z

OK-Z3) (impulses not

for battery supply
Z5 = as Z3, but with 2 relays/
SPDT relays

4)

= E1 + HA (ATEX Exi)

1A

4)

2A

= E2 + HA (ATEX Exi)

4)

3A

= E3 + HA (ATEX Exi)

4)

= E5 + HA (ATEX Exi)

5A

2)

Replace ‘H’ with ‘G’ to order GPH (GPM) (e. g. 15 G instead of 15H)

M = M20
N = ½“ NPT

3)

S

= M20 +
cooling
fin

3)

T

= ½“ NPT

+ cooling

fin

0 = without
N = without batte
Y = special

option,
(specify in
clear text; not
for ATEX)

ry

DON-H 01/0721

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DON-H

13. Dimensions

[mm]

Electronic Options -Zx/1A…5A

Option -M/-N (standard)

Option -S/-T (with cooling fin)

page 28

DON-H 01/0721

14. Troubleshooting

Oval gear flowmeters have two clearly distinct portions: one of which is
mechanical, wetted areas with the oval gears surrounded by a housing, and the
other is the electrical area, which includes the pulse output board.

Details of some key troubleshooting steps will now be provided. Please also refer
to the instructions on troubleshooting errors contained on the following page.

Step 1 - Check application, installation and set-up.
Carefully read the section on mechanical installation to ensure full knowledge of
all relevant installation and application factors which may affect the operation of
the counter. These include pulsation, trapped air or selecting the wrong counter,
including incorrect flow rate, temperature or pressure, or material incompatibility.
Refer to the section on electrical installation to ensure correct cabling.

Step 2 - Check for blockages.
For new and modified systems in particular, the most frequent cause of error or
sub-optimal counter operation is internal system or counter blockages due to
foreign particles, such as beads of condensate, sealing tape residues or mixtures
of deposits, rust, etc.

DON-H

Step 3 - Guarantee flow rate.

Flow stopping or a flow rate declining below the usual limit may be attributable to
a blocked screen, flowmeter rotors which are stuck or damaged, a defective
pump, closed valves or an insufficient liquid level in the storage tank.

Step 4 - The oval gears in the counter must revolve.
This rotation is audible: try holding a screwdriver blade against the counter
housing and push the handle right against your earlobe. Test the counter as
required with flow switched on and off, to ensure you are familiar with the audible
sound of rotation.

Step 5 - Ensure that pulses are generated when liquids flow.
Here, a multimeter is often not fast enough to capture the pulse sequence of the
reed switch or the Hall Effect sensor. However, an oscilloscope will allow you to
observe the output pulse sequence. When testing the reed switch pulse, a pull-up
resistor must be installed between the single connection of the reed switch and
the supply voltage, while the other connection must be connected to the
reference potential of the measurement device (oscilloscope) (see electrical
installation).

Step 6 - Confirm device operation.
If a mounted electronic component is connected to the DON, check the functions
by simulating a pulse input. A reed switch pulse input can be simulated by a swift
and pulse-driven short-circuiting of the input terminals.

DON-H 01/0721

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DON-H

Problem Possible cause Solution

1. Ground shielding of the signal cable

2. Re-lay the cable away from sources of high current

1. Eliminate the source of the air or gas pocket

2. Install an upstream air separator

1. Increase back-pressure to the pump

2. Install a quick-response one-way check valve

3. Install a pulsation damper between the pump and the counter

4. Recalibrate the counter on site, to compensate for pulsations

5. Replace the pump type for a pump allowing smooth supply

n

1. Check, repair, clear or replace rotors

1.

Check me

2. Check concentricity of the rotor shafts in the chamber

1. Ground shielding of the signal cable

2. Re-lay the cable away from sources of high current

3. Check all electrical connections and wires for the presence of current.

Che

1.
visi

2. Check for any obstructing foreign particles

3. Clear, repair or replace rotors

1. See instructions for re-mounting the counter, focusing on the
positioning of rotors and magnets above all

1. Check screw terminal connections and soldering joints

2. Ensure the presence of DC voltage at +Vs and 0V/GND and that the
analytical electronics connected include a pull-up resistor when using
the reed switch

3. Replace output plate

1.

Check

2. Check screw terminal connections and the presence of electrical
current

3. Repair/replace analytical electronics

Counter
values too
high

Counter
values are
too low

No output
from
counter

No flow
signals
indicated
on the
analytical
device

1. Disruption of the
output signal

2. Air or gas pockets

3. Pulsating flow
from the piston pump

1. Damag
rotors

2. Damaged or worn
measurement
cham

3. Disruption of the
output signal

1. Soiled rotors

2. Counter incorrectly
mounted

3. No output from the
output board

1. Defective
analytical electronics

ed or wor

ber

asurement chamber for damage - repair as required

whether the rounded teeth at the base of the chamber are

ck

ble

settings and parameter data in the set-up menu

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DON-H 01/0721

15. Use in Ex areas

15.1 General information

The flow meter is intended for commercial systems and may only be used in
accordance with the information in the technical documentation from Kobold and
the information on the nameplate. It is operated exclusively together with certified
products via an intrinsically safe circuit. They correspond to the applicable
standards and regulations. The installation regulations (e.g. EN 60079-14) for
systems in potentially explosive areas must be considered.

15.1.1 General safety information

The flow meter corresponds to the state of the art and is operationally safe. The
flow meter can bear a residual risk if it is used and operated improperly by
untrained personnel. Every person who is entrusted with the installation,
commissioning, maintenance or repair of the flow meter must have read and
understood the assembly instructions and in particular the safety instructions.

a) When selecting a product and using it as intended, follow the general rules of

technology.

b) All connected electrical and mechanical equipment must be suitable for the

respective application.

c) Observe the information in these operating instructions as well as the

conditions of use and permissible data that appear on the imprints /
nameplates of the respective products.

d) It must be ensured that only the product types of protection that correspond

to the zones are installed!

e) The product is only approved for appropriate and intended use in a normal

industrial atmosphere. Immersion in liquids is not permitted.

f) It must be ensured that no falling objects can hit the product. If there is a risk

of impact sparks, external housing parts made of light metal must be installed
in a protected manner.

g) The operator must ensure lightning protection for the entire system in

accordance with local regulations.

h) It is the responsibility of the installer to ensure that the flow meter functions

properly in connection with the individual evaluation devices and that it is
approved for the intended purpose.

i) A safe to operate and non-critical medium is elementary for this type of

protection and must be strictly adhered to!

DON-H

15.1.2 Intended use

a) To ensure safe operation, the products may only be used in accordance

with the information in the assembly instructions. When using the device,
the legal and safety regulations required for the respective application
must also be considered. This also applies analogously to the use of
accessories.

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DON-H

b) If the instructions given here are not followed or if the product is handled

c) The products are not safety elements in the sense of their intended use.
d) Only original parts from the manufacturer may be used.
e) Flammable media within the flow meter must not be heated in Zone 1

f) Charging of the medium is not permitted; measures by the operator are

15.1.3 Temperature classes and medium temperatures

Z

Material seal Marking Cat. 2 (Zone 1) TC Cat. 3 (Zone 2) TC

1
2
3

FEP / EPDM 92 e = 3

4
5
6
7

Fluoroprene e = 5

8

improperly, our liability is void. In addition, the warranty on products and
spare parts does not apply.

above 80% of their ignition temperature without taking special measures

necessary.

FKM e = 1

NBR e = 4

-20 °C .. 80 °C T4

-20 °C .. 100 °C T3

-20 °C .. 80 °C T4 -20 °C .. 90 °C T4

-20 °C .. 110 °C T3

-20 °C .. 80 °C T4

-20 °C .. 100 °C T3

-20 °C .. 80 °C T4

-20 °C .. 130 °C T3 -20 °C .. 130 °C T3

-20 °C .. 90 °C T4

-20 °C .. 110 °C T3

-20 °C .. 120 °C T3

-20 °C .. 90 °C T4

-20 °C .. 110 °C T3

-20 °C .. 90 °C T4

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DON-H 01/0721

DON-H

15.1.4 Servicing, maintenance

Definition of terms according to IEC 60079-17:

Maintenance and repair: A combination of all activities carried out in order to
keep an object in a condition or to bring it back into a condition that meets the
requirements of the relevant specification and ensures the execution of the
required functions.

Inspection: An activity that involves the careful examination of an object with the
aim of making a reliable statement about the condition of this object, without
dismantling or, if necessary, with partial dismantling, supplemented by measures
e.g. measurements is carried out.

Visual inspection: A visual inspection is an inspection in which visible defects
are found (e.g. missing screws) without the use of devices or tools.

Close-up inspection: An inspection that, in addition to the aspects of the visual
inspection, identifies defects such as loose screws that can only be removed
through the use of access devices (e.g. if necessary stairs) and tools. For close­up tests, a housing usually does not need to be opened or the equipment needs
to be de-energized.

Detailed inspection: An inspection in which, in addition to the aspects of close­up inspection, defects such as loose connections, which can only be identified by
opening housings and / or, if necessary, using tools and testing equipment, are
treated.

Maintenance measures may only be carried out by qualified persons.
Only accessories that meet all the requirements of the European directives and
national legislation may be used in potentially explosive areas.

Maintenance measures including dismantling the flow meter may only be
carried out in a non-explosive atmosphere.
Components may only be replaced with original spare parts that are also
approved for use in Ex areas. Repairs only by the manufacturer or specialist
workshop.
The products must be regularly serviced and cleaned in the Ex area. The
intervals are determined by the operator in accordance with the environmental
stresses on site.

Detailed

inspection

every 12

months

Activity

Visual

inspection

per month

Close-up

inspection

every 6 months

Visual inspection of the flow

1

meter for damage and remove

●

dust deposits

2

Check for integrity and function

Examination of the entire

3

system

DON-H 01/0721

●

In the operator's area of responsibility

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DON-H

15.1.5 Troubleshooting

No changes may be made to products that are operated in connection with
potentially explosive areas. Repairs to the product may only be carried out by
specially trained and authorized specialists.

15.1.6 Disposal

The packaging and used parts must be disposed of in accordance with the
regulations of the country in which the product is installed.

15.2 ATEX version Exi (electronics options xA)

While evaluating the product, following Norms were considered:

a) EN IEC 60079-0: 2018 Ed. 7 Hazardous areas - Part 0: Equipment -

b) IEC 60079-11: 2011 Ed. 6 + Corr. 2012 / EN 60079-11: 2012 Hazardous

c) EN ISO 80079-36 2016 Explosive atmospheres - Part 36: Non-electrical

d) EN ISO 80079-37 2016 Explosive atmospheres - Part 37: Non-electrical

General requirements

areas - Part 11: Equipment protection by intrinsic safety "i"

devices for use in explosive atmospheres - Basics and requirements.

equipment for explosive atmospheres – Non electrical type of protection
constructional safety "c", control of ignition source "b", liquid immersion "k"

15.2.1 General information on explosion protection

The electrical connection is made via a plug in a separate inductively coupled
electronics compartment - exclusively in intrinsically safe systems. The
electronics option HA is combined with the electronics models ZOK-E * M
(compact version) or ZOK-E * K (remote electronics) in accordance with LOM 16
ATEX 2062 to form the electronics options 1A, 2A, 3A and 5A.

Permitted use

The intrinsically safe flow meter can be used as follows:

 In Zone 2 (Gas-Ex, Category 3G, EPL Gc) in explosion groups IIA, IIB and

IIC.

 The requirements for simple electrical equipment in intrinsically safe circuits

in Zone 1 according to EN 60079-11 are met for various versions.

 The qualification with regard to the surface temperature is T4 / T3; for all

gases, vapours and fog with an ignition temperature ≥ 135 ° C / ≥ 200 ° C, the
products are not an ignition source.

 The permissible ambient temperature range is from -20 ° C ≤ Ta ≤ 80 ° C.
In accordance with the installation regulations, housing must be grounded using
the earthing clamps. The maximum connection cross-section is 4 mm2.

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DON-H 01/0721

External earthing clamp

15.2.2 Electrical parameters of the electronic option HA when used in
Zone 1/2

Electrical data:

 • Pi ≤ 1 W @ max. 80 ° C ambient temperature

DON-H

Electronics
option

Hall sensor HA

Reed switch HA

Use in zone

1

2

1
2

Ui Ii Ci

270 nF

UiIIB ≤ 32 VDC ≤ 100 mA

10 nF

DON-H 01/0721

page 35

DON-H

,2µ

15.2.3 Wiring examples for electronics option HA with Zener barriers

Control Drawing for DON-***HA - Oval Gear Flowmeter with pulse output

(Reedswitch, usage with zener barrier) for Group IIB zone 1

Supply

max. 26VDC

Supply

Uo = max. 28 Vdc
Io = max.100 mA
Po = max. 700 mW

zener barrier

8

7

28V

300R

PA

P&F Z728

BAS 01 ATEX 7005

II (1) GD [Ex ia Ga] IIC

-20 °C ≤ Ta ≤ 60 °C

Uo = 28 Vdc
Io = 93 mA
Po = 650 mW
C = 650nF

OIIB

L = 16,4 mH

OIIB

1

2

Safe Area

PA

LiYCY

2 x 0,5 mm

Lmax = 100 m

C ≤ 1µH/m

C

F/m

C ≤ 0

L

Hazardous Area

Group IIB, zone 1

-20°C ≤ Ta ≤ +60°C

2

Flowmeter
DON-* ** ** ** HA * *

simple apparatus

GND

ExGuide 19 ATEX 0007

II 3G Ex ic IIC T4/T3 Gc

OUT HA/GA

GND

+Vs

OUT DA

HA

ExGuide 19 ATEX 0007

II 2G Ex h IIC T4/T3 Gb

Sensor

Ui ≤ 32 Vdc
Ii ≤ 100 mA
Pi ≤ 1 W
Ci = negligible
Li = negligible

-20 °C ≤ Ta ≤ 80

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DON-H 01/0721

DON-H

Control Drawing for DON-***HA - Oval Gear Flowmeter with pulse output

(Hallsensor, usage with zener barrier) for group IIB zone 1

Supply

12 - 26VDC

Signal output

Load < 5mA

Supply

Uo = max. 28 Vdc
Io = max.100 mA

Po = max. 700 mW

Zener barrier

8

7

6

28V

300R

28V

36R

PA

P&F Z787

BAS 01 ATEX 7005

II (1) GD [Ex ia Ga] IIC

-20 °C ≤ Ta ≤ 60 °C

Uo = 28 Vdc

Io = 93 mA
Po = 650 mW
C = 650 nF

OIIB

L = 16,4 mH

OIIB

1

2

3

45

Safe Area

PA

Hazardous Area

Group IIB, zone 1

-20°C ≤ Ta ≤ +60°C

LiYCY

3 x 0,5 mm
Lmax = 100 m

C ≤ 1µH/m
C ≤ 0,2nF/m

2

L
C

Flowmeter
DON-* ** ** ** HA * *

simple apparatus

GND

ExGuide 19 ATEX 0007

II 3G Ex ic IIC T4/T3 Gc

OUT HA/GA

GND

+Vs

OUT DA

HA/KA/BA/GA

ExGuide 19 ATEX 0007

II 2G Ex h IIC T4/T3 Gb

Sensor

Ui ≤ 32 Vdc
Ii ≤ 100 mA
Pi ≤ 1 W
Ci = 270 nF
Li = negligible

-20 °C ≤ Ta ≤ 80

15.2.4 Electronics options 1A to 5A when used in Zone 1/2

With the electronics options 1A to 5A, the electronics option HA in connection
with a flow meter / doser / controller of the type ZOK-E * K * F3 or ZOK-E * M *
F3 ** according to LOM 16 ATEX 2062 X is a simple electrical equipment used
and supplied electrically by this equipment only.
Interconnection examples for options 1A to 5A can be found in the instruction
manual supplement Zok-Ex-supplement.

DON-H 01/0721

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DON-H

15.2.5 Commissioning, installation

Depending on the IP degree of protection, the time for cleaning the equipment
(dust deposits) must be specified. Other important facts:
a) The product may only be put into operation in Zone 2 (Cat. 3G, EPL Gc) or in

b) The requirements for simple electrical equipment, which apply to the

c) The products may only be used in a normal industrial atmosphere. If

d) The operation of the product is only permitted in the completely assembled

e) The environmental conditions specified in the operating instructions must be

f) The flow meter may only be operated when it is completely filled. Exceptions

g) Thermal radiation from third-party products / components must be taken into

h) The flow meter must be protected against inadmissible ingress of liquids and

i) Stuck parts (e.g. due to frost or corrosion) must not be loosened with force in

j) The flow meter may only be exposed to low vibrations, see also IEC 34-14.
k) A direct electrostatic discharge of high energy onto the equipment is not

l) In particular, isolated established capacities must be prevented.
m) All construction parts must be connected to one another in metal, central

n) Equalizing currents must not be routed through the metallic structures.
o) The intrinsically safe connection must be made using approved / tested

p) Only Zener barriers or switching amplifiers whose output circuits are

q) The voltage of the supply devices must be less than or equal to the voltage Ui

r) The total current Io of the supply devices must be less than or equal to the

Zone 1 (Cat. 2G, EPL Gb) in intrinsically safe circuits by specialists with a
qualification similar to a qualified person in accordance with TRBS 1203.

potentially explosive area of zone 1 according to EN 60079-11, are met.

aggressive substances are present in the air, the manufacturer should always
be consulted. The products must be appropriately protected in adverse
environmental conditions.

and undamaged housing. In the event of possible damage, the operator may
have to consider the spread of zones. In addition, operation is not permitted if
the housing is damaged.

strictly followed. Appropriate protection against adverse environmental
conditions needs to be realised.

according to the operator's risk assessment are only permitted for start-up
and shutdown.

account.

/ or contamination.

the presence of an explosive atmosphere. Icing must therefore be avoided.

permitted (usually cannot be generated by human contact). To ensure that
electrostatic charges are discharged, the national requirements must be
taken into account.

connection for equipotential bonding.

evaluation devices that may have to be equipped with suitable Zener barriers
or switching amplifiers.

approved / tested for use in an explosive atmosphere may be used. In
Europe, use in Zone 1 requires an EC type-examination certificate for the
equipment in question, which is issued by a body designated for explosion
protection.

of the flow meter.

current Ii of the flow meter.

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DON-H 01/0721

DON-H

s) The ignition limit curves from EN 60079-11 must be taken into account in

Zone 2 without a safety factor and must be observed during installation. The
safety factor 1.5 is to be used in zone 1. A control drawing (system
description) to be created by the installer / operator is required for the
installation of the intrinsically safe circuit.

t) Equipotential bonding must be established along the intrinsically safe circuit.

The certificates, including the special conditions specified therein, must be
taken into account.

u) Within the potentially explosive area, assembly may only be carried out in

accordance with the locally applicable installation regulations. The following
conditions must be observed (incomplete):

a) Installation and maintenance may only be carried out in an explosion-free

atmosphere and in compliance with the regulations applicable in the
operator's country.

b) Additional precautions must be taken if the presence of hydrogen sulfide,

ethylene oxide and / or carbon monoxide is to be expected: These
substances have a very low ignition energy!

c) If these substances are present and if a substance of explosion group IIC

is present and an explosive atmosphere is likely to be present, only non­sparking tools may be used!

d) The flow meters must not be used in systems with cathodic corrosion

protection; in borderline cases, consult the manufacturer.

e) Particular care must be taken to ensure that no stray currents (e.g.

generated by motors that are operated on frequency converters, welding
systems and / or cathodic corrosion protection systems) are fed through
the flow meter.

DON-H 01/0721

page 39

DON-H

15.2.6 Identification of the flow meter (nameplate)

Basic device label DON-H (example)

Device label for Ex version intrinsically safe, option HA (example)

page 40

DON-H 01/0721

16. EU Declaration of Conformance

We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:

Oval Gear Flow Meter Model: DON-H...

to which this declaration relates is in conformity with the directives noted below:

2014/68/EU PED

 Category II Diagram 8, pipes, group 1 dangerous fluids
 Module D, marking CE0575
 Notified body: DNV GL
 Certificate No. PEDD000000R

2011/65/EU RoHS
2015/863/EU Delegated Directive (RoHS III)

All devices with electronic are in conformance with:

DON-H

2014/30/EU EMC Directive
2014/34/EU ATEX Directive

Notified body BVS 0158 (DEKRA EXAM, Bochum)

EN 61326-1:2013 Electrical equipment for measurement, control and

laboratory use - EMC requirements – Part 1: General
requirements

EN 60079-0: 2018

Explosive atmospheres - Part 0: Equipment – General requirements

EN 60079-11: 2012

Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"

DIN EN 80079-37:2016

Explosive atmospheres - Part 37: Non-electrical equipment for explosive
atmospheres - Non-electrical type of protection constructional safety "c", control
of ignition sources "b", liquid immersion "k"

EN 60079-1:2014
Explosive atmospheres - Part 1: Equipment protection by flameproof
enclosures 'd'

DON-H 01/0721

page 41

DON-H

Also complies with the following European and national standards and technical
regulations:

 Technical rules for hazardous substances (TRGS) 727: 2016, avoidance of

Hofheim, 30 July 2021

ignition hazards due to electrostatic charges

H. Volz M. Wenzel

General Manager Proxy Holder

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DON-H 01/0721

17. Statement of Conformity

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18. State of safeness

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