PKP DS11 User manual

Instruction Manual
DS11
Plastic variable area flowmeter with
glass measuring tube
PKP Prozessmesstechnik GmbH
Borsigstraße 24
D-65205 Wiesbaden- ordenstadt
Tel.: ++49-(0)6122-7055-0
Fax: ++49-(0)6122-7055-50
Email: [e-mail] www.pkp.de

Table of Contents
Safety Information..................................................................................................................2
Functional Description...........................................................................................................3
Mounting and Adjustment......................................................................................................3
Limit Switches........................................................................................................................4
Maintenance and Care.........................................................................................................11
Safety Information
General Instructions
To ensure safe operation, the device should only be operated according to the specifica -
tions in the instruction manual. The requisite Health & Safety regulations for a given
application must also be observed. This statement also applies to the use of accessories.
Every person who is commissioned with the initiation or operation of this device must have
read and understood the operating instructions and in particular the safety instructions!
The liability of the manufacturer expires in the event of damage due to improper use, non-
observance of this operating manual, use of insufficiently qualified personnel and unau-
thorized modification of the device.
Proper Usage
The flowmeters of the DS11 series are used to monitor the continuous flow of liquids and
gases. Any other use of the instrument is prohibited and outside the scope of application.
Unless otherwise stated, the scales of the devices refer to air at 1.2 bar abs. At 20 °C or
water.
In particular, applications in which shock loads occur (for example, pulsed operation)
should be discussed and checked in advance with our technical staff.
The series DS11 flow meter devices should not be deployed as the sole agents to prevent
dangerous conditions occurring in plant or machinery. Machinery and plant need to be
designed in such a manner that faulty conditions and malfunctions do not arise that could
pose a safety risk for operators.
Dangerous substances
For dangerous media such as e.g. Oxygen, Acetylene, flammable or toxic substances as
well as refrigeration systems, compressors, etc. must comply with the relevant regulations
beyond the general rules.
DS11 Instruction manual 11/2021 page 2

ualified Personnel
The DS11 devices may only be installed by trained, qualified personnel who are able to
mount the devices correctly. Qualified personnel are persons, who are familiar with
assembling, installation, placing in service and operating these devices and who are suit-
ably trained and qualified.
Inward Monitoring
Please check directly after delivery the device for any transport damages and deficiencies.
Additional with reference to the accompanying delivery note the number of parts must be
checked.
Claims for replacement or goods which relate to transport damage can only be considered
valid if the delivery company is notified without delay.
Functional Description
The variable area flow meter must be installed vertically. The flow direction is from low to
high scale.
The connection is made with connection pieces corresponding to the instrument version.
The lines must be routed centrically to the connection holes of the measuring instrument
with as little stress as possible. If necessary, the pipes must be supported in order to avoid
the transmission of vibrations to the measuring instrument.
Mounting and Adjustment
The actual operating pressure and the temperature of the medium in the installation must
not exceed the maximum values specified in the specifications.
1. Close the needle valve on the flowmeter.
2. Open the shut-off valve upstream and downstream of the flowmeter.
3. For liquids, ensure careful venting of the pipeline.
In the Case of gases, allow the operating pressure to rise slowly.
Avoid bouncing (danger of glass breakage).
4. Open the needle valve and set the desired flow rate.
5. The flow value is read off at the upper edge of the float.
If the operating parameters deviate from the calibration data (flow range, medium, pres-
sure, density and temperature), the displayed flow value can be converted in accordance
with VDI / VDE guideline 3513.
DS11 Instruction manual 11/2021 page 3

Limit Switches
The flowmeters can be equipped with a maximum of two limit switches.
The switching function of the limit switch can be designed as monostable or bistable.
Monostable function: Switching pulse as float passes through switching point,
independent of direction of movement.
Bistable function: Stable changeover as float passes through switching point.
Example (bistable): Above limit: switching point "High"
Below limit: switching point "Low"
For switching performance and electrical data refer to section "Technical data".
Electrical connections:
Connection of limit switch - 2-wire AMUR (standard):
1 Lower limit switch to terminal 1
2 Upper limit switch to terminal 2
The connection box includes an EMC filter unit.
DS11 Instruction manual 11/2021 page 4

Connection of limit switch - 2-wire AMUR, without connection box:
1 Limit switch (without connection box)
2 Blue cable -
3 Brown cable +
4 External EMC filter
5 Receiver device
When connecting to an EMC filter, the ground terminal must be connected to the back rail
of the flowmeter.
Connection of limit switch - 3-wire (transistor):
bn - brown: supply voltage +
bk - black: switch
bu - blue: supply voltage -
DS11 Instruction manual 11/2021 page 5

Settings of limit switches:
1 Clamping screw
2 Back rail
3 Limit switch
The following procedures are to be performed:
•Remove both clamping screws 1.
•Slide the limit switch over the measuring glass.
•Use the two clamping screws 1 to fasten the limit switch 3 to the back rail 2 of the
measuring device.
•Re-install the protective cover following installation.
For installation after the fact, the measuring glass must be removed. Refer to chapter
"Maintenance and care”
CAUTIO !
When setting the limit switch, be careful to lay the cable so that it does not get damaged.
Avoid canting of the limit switch during installation: glass breakage
The connecting lead of the limit switch is guided through a hole in the base of the device
and
sealed.
Observe the following for bistable limit switches with external EMC filters in separate DI
rail
housing:
The EMC filter unit and the back rail of the meter must be galvanically connected and
grounded.
An isolation switching amplifier with intrinsically safe circuit controls is necessary to
operate the
AMUR limit switches.
DS11 Instruction manual 11/2021 page 6

Minimum distance between two limit switches:
Where two limit switches are used in one device and also where meters with limit switches
are in close proximity of each other, minimum distances must be maintained in order to
avoid mutual influence of the switches.
Switching performance of limit switches
2-wire limit switch AMUR, monostable
Float outside of the limit switch: signal ≥3 mA
Float inside of the limit switch (centre): signal ≤1 mA
2-wire limit switch AMUR, bistable
Independent of the float position and passage 1: signal ≥3 mA
Prerequisite: the float is outside the limit switch.
I FORMATIO !
For the proper initialisation after power up, the bistable AMUR limit switch should pass
through each of 1 and 2 once.
3-wire limit switch, transistor
Independent of the float position and passage 2: signal ≤1 V
Prerequisite: the float is outside the limit switch.
Switching performance
DS11 Instruction manual 11/2021 page 7

Reversed function of limit switch:
The bistable limit switches can be changed from normally open switch to normally closed
switch.
The pre-fabricated connection cable must be long enough to do this.
When installing and setting, make sure the cable is not damaged when laid.
•Loosen terminal screw 1.
•Turn turnbuckle 2 counter-clockwise to loosen.
•Pull out the measuring glass along with the limit switch.
•Turn limit switch 180°.
•Install the measuring glass.
•Tighten turnbuckle 2 by hand.
•Use a 3 mm pin to tighten the turnbuckle by turning 4 to max. 5 times in 120°
increments 3 in a clockwise direction.
CAUTIO !
To avoid breakage, the measuring glass must be positioned centrically between the
gaskets.
Test the leak tightness by suitable measures prior to start-up.
DS11 Instruction manual 11/2021 page 8

Grounding connection:
The measuring unit is grounded on the back rail 1 (M4 thread). This connection only
ensures electrostatic grounding of the device and does not meet the requirements for
equipotential bonding.
Position of the ground terminal
DA GER!
The grounding wire may not transfer any interference voltage.
Do not use this grounding cable to ground any other electrical devices.
Ingress protection:
The limit switches with connection housing meet all requirements of ingress protection
IP65.
Therefore it is essential to observe the following points:
•Use only original gaskets. They must be clean and free of any damage. Defective
gaskets must be replaced.
•The electrical cables used must be undamaged and must comply with regulations.
•The cables must be laid with a loop 3 upstream of the measuring device to prevent
water from getting into the housing.
•The cable feedthroughs 2 must be tightened.
•Close the unused cable feedthroughs with blanking plugs 1
DS11 Instruction manual 11/2021 page 9

Ingress protection
DA GER!
After all servicing and maintenance work on the measuring device, the specified protection
class
must be ensured again.
Technical data of limit switches:
1) For devices with the valve at the top in the output and devices with flow regulators for
variable outlet pressure, the function is inverted!
I FORMATIO !
The limit switches with ring diameters of 15 mm / 0.6" as max. contact can only be used
up to 60 l/h / 15.8 GPH water or 2400 l/h / 89.3 SCFH air (outer diameter of the measuring
glass).
DS11 Instruction manual 11/2021 page 10

Maintenance and Care
Due to the small number of moving parts, these devices require minimal maintenance.
evertheless, regular performance tests and maintenance will not only increase the
service life and functional safety of the device but also those of the entire installation.
The frequency of maintenance depends on the following:
•The contamination of the medium
•Ambient conditions (e.g. vibrations)
•
When performing maintenance, be sure to check for the following:
•Proper function of the switching contact (on devices with limit value signal sensors)
•Leakage at the device
•Free movement of the float
The user is responsible for setting suitable maintenance intervals for the specific
application.
Maintenance Notes:
•The free movement of the float can be checked by changing the flow rate and
observing the float.
•In most cases, cleaning the device will only require rinsing it with clean liquid. In
stubborn cases (e.g. lime deposits), standard, commercially available cleaners can
be used as long as their ingredients will not attack the materials used in the device.
Replacing the Measuring Tube:
Caution: To avoid glass breakage, the measuring tube must be installed centered
between the seals.
1. Close the valves upstream and downstream of the device to prevent escape of the
medium being measured.
2. Close the needle valve at the device.
3. Slide the Plexiglas protective cover upward and then remove it toward the front.
4. To release the measuring tube, turn the retainer in the base of the device counter-
clockwise. The tube can now be removed.
To reinstall the tube, follow the above instructions in reverse order.
DS11 Instruction manual 11/2021 page 11

Flow Measurement and Monitoring
DS11
Plastic Variable Area Flowmeter
for low Flow Rates
with Glass Measuring Tube
•for low viscous li uids and gases
•fittings made of PVDF
•with integrated needle valve
•limit switches optional
•accuracy class 2,5
•max. pressure 4 bar
max. temperature 100 °C
•measuring ranges: 0,25...160 l/h water
0,5...5000 Nl/h air
Description:
The flowmeters DS11 operate according to the proven vari-
able area principle. The flowing media moves a float upwards
against gravity in a conical measuring tube. The height of the
float indicates the flow rate and may be read off a burnt-in
scale on the measuring tube.
Optional inductive contacts, which are mounted on the meas-
uring tube, may be used for flow rate limit detection. All
meters are e uipped with an integrated needle valve for
exactly regulating the flow rate.
Typical applications:
Variable area flowmeters model DS10 are mainly used for
measuring and monitoring the flow rate of low- viscous li uid
and gaseous media.
Scales for water or air at standard operating conditions have
already been defined. For other media or different process
conditions special scales are available.
PKP Prozessmesstechnik GmbH
Borsigstr. 24 • D-65205 Wiesbaden
S [phone] • T [phone]
[email protected] • www.pkp.de
20181119

Measuring ranges: (Standard Scales)
Float made of stainless steel
The measuring ranges given below serve as orientation. Please
indicate medium, pressure and temperature, we will calculate an
individual scale for you.
Measuring
range No
Measuring
range
[Nl/h air, 20°C,
1,2 bar abs.
Contact
version
01
02
03
04
05
06
07
08
09
10
11
12
13
14A
15A
0,5...5
0,8...8
1,6...16
4...40
6...60
10...100
25...250
50...500
80...800
100...1000
180...1800
240...2400
300...3000
400...4000
500...5000
A
A
A
A
A
B
B
B
B
B
B
B
B (min)
B (min)
B (min)
[l/h water
16
17
18
19
20
21
22
23
24
0,25...2,5
0,5...5
1,2...12
2,5...25
4...40
6...60
10...100
12...120
16...160
A
B
B
B
B
B
B (min)
B (min)
B (min)
Contacts: The contact version is determinated by the measuring
range.
(min) = Contact available for minimum monitoring only.
Dimensions:
The upper edge of the float is the reading edge.
Order Code:
Order number: DS11.
Plastic variable area flowmeter
with glass measuring tube
2. 1. P. 1. 06. 1. 1. 0.
Model:
2 =Standard version
Process connection:
1 = G 1/4 female on back
2 = 1/4“ NPT on back
Material:
P = PVDF
Gasket:
1 = PTFE/FPM (standard)
2 = PTFE / FFKM
3 = EPDM
Measuring ranges:
01...24 = according to table
99 = special ranges
Valve:
0 = without
1 = valve at inlet (standard)
2 = valve at outlet
Limit switches:
0 = without
1 = 1 contact (model A)
2 = 2 contacts (model A)
3 = 1 contact (model B)
4 = 2 contacts (model B)
Options (multiple answers possible):
0 = without
1 = panel mounting kit
2 = cable connector housing for devices with contact
Special connections like hose connectors, SWAGELOK,
ERMETO or others on re uest.
To operate the limit switches, switch amplifiers of type P+F are re uired.
See data sheet P+F.
Technical Data:
Max. pressure: 4 bar
Max. medium
temperature: 100 °C (65 °C with contact)
Accuracy: 2,5 % of measured value
Materials:
fitting: PVDF
measuring tube: borosilicate glass
float: st. st. 1.4401, optional glass, POM,
Titan, Hastelloy® C4, polypropylene
valve: st. st. 1.4571,1.4404
optional: PEEK
gaskets: PTFE / FPM,
optional: PTFE /FFKM, PTFE / EPDM
protective cap: polycarbonate
Switching contact: acc. to NAMUR (bistable)
1 mA passage from top to bottom
3 mA passage from bottom to top
(monostabile or 3-wire contacts on
re uest)
PKP Prozessmesstechnik GmbH
Borsigstr. 24 • D-65205 Wiesbaden
S [phone] • T [phone]
[email protected] • www.pkp.de
Flow