PKP DS08 Manual de usuario

Instruction Manual

DS08

Viscosity Compensated Variable Area Flowmeter and

Switch

- mounting independent all metal for high pressures -

PKP Prozessmesstechnik GmbH

Borsigstraße 24

D-65205 Wiesbaden- ordenstadt

Tel.: ++49-(0)6122-7055-0

Fax: ++49-(0)6122-7055-50

Email: info@pkp.de

Table of Contents
Safety Information..................................................................................................................2
Overview................................................................................................................................4
Installation..............................................................................................................................5
Connecting devices equipped with Reed switches................................................................7
Electrical connection..............................................................................................................9
Contacts for DS08.M:...........................................................................................................10
Contacts for DS08.S............................................................................................................12
Setting the switch point........................................................................................................14
Troubleshooting guide.........................................................................................................15
Maintenance / Maintenance plan.........................................................................................16
Degree of protection (IP-Code)............................................................................................16
Returns.................................................................................................................................16
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 variable area flowmeters of the DS08 series are used exclusively for monitoring and
indicating continuous flows of liquid media that do not attack the materials used. All other
usage is regarded as being improper and outside the scope of the device. 
Process conditions: 
Max. pressure:  brass version: 300 bar (DS08.M)
250 bar (DS08.S)
st. st. version: 350 bar (DS08.M)
300 bar (DS08.S)
Max. medium-temperature:  100 °C (optional 160 °C) 
Ex-devices: acc. to ATEX-declaration
DS08 Instruction manual  03/2020 page  2

In particular, applications in which shock loads occur (for example, pulsed operation)

should be discussed and checked in advance with our technical staff.

In particular applications in which shock loads occur (e.g. intermittent operation) should be

discussed and checked in advance with our technical staff.

Do not use flow monitors with fast-switching valves.

The series DS08 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.

Qualified Personnel

The DS08 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.

DS08 Instruction manual 03/2020 page 3

Overview

1: Process connection (outlet)

2: Device body

3: Switch contact and female socket or switch contact

with cable

4: Switch point adjustment scale

5: Display housing with display scale and pointer

mechanism

6: Process connection (inlet)

Switch point adjustment scale:

A scale is applied to the device body, to which the

desired switch point can be adjusted.

Display scale:

On the device, a display housing is mounted with integrated

indicator scale and pointer movement. The pointer on the

scale indicates the current flow value.

DS08 Instruction manual 03/2020 page 4

Installation

Process connection:

The following requirements must be observed to avoid damage to the flow monitor or the

system:

a process connection suitable for the device must be provided by the customer

check connection size and screw-in depth

use suitable sealants (liquid sealants damage the flow monitor if they run in)

seal properly

Ambient conditions:

do not install the flow monitor as a supporting part in a pipe system

the medium must not carry solid bodies. Magnetic particles accumulate on the

magnetic float and impair its function.

Check corrosion and antifreeze agents from the application for compatibility.

Notice:

The following requirements must be observed, otherwise the function of the flow monitor is

impaired or measurement results are falsified:

external magnetic fields will influence the switch contact. Keep sufficient distance to

magnetic fields (e.g. electric motors).

piping, process connections or supports made of ferromagnetic material influence

the magnetic field of the device. Keep a space of minimum 100 mm to those

materials (e.g. steel).

changes in cross-section, branch-offs or arcs in the pipe system impair measuring

accuracy. Ensure that the unimpeded flow sections are maintained (in front of

instrument 10 x nominal diameter, behind the instrument 5 x nominal diameter).

ever reduce the pipe diameter immediately before the device.

in the case of liquid media, take appropriate steps to ensure that the device is ven-

ted.

to ensure measuring accuracy, the device must always be completely filled with

medium.

vent the pipeline. If there are air pockets in the line during the measurement, this

could result in damage to the device caused by hydraulic shock. This may cause

malfunctions.

ensure that the plant is operating without cavitation. Cavitation may result in mal-

functions and damage to the device.

ensure that the medium is flowing continuously. Pulse-like staggered loads could

destroy the device. This may result in serious injury to the user.

if the mediums is contaminated by solids, a strainer must be installed before the

device (e.g. SF00 or SF01 from PKP)

DS08 Instruction manual 03/2020 page 5

Direction of flow:

Only install the flow monitor in one of the positions displayed in the drawing. The medium

must flow in the direction of the arrow (from a low to a high scale value).

DS08 Instruction manual 03/2020 page 6

Connecting devices equipped with Reed switches

Reed switches are basically designed for small contact ratings. To connect a load with

higher power consumption it is indispensable to use a contact protection relay (e.g. our

series MSR01)

If you connect directly a load to a Reed contact the following recommendations should be

considered.

one of the contact rating values printed on the switching unit must not to be exceeded,

even momentarily. This is valid for each of the given values individually: voltage, current,

power. The Reed contact integrated in the switching unit is very sensible to electrical over-

load

Danger of overload is given by the following applications:

•inductive load

•capacitive load

•lamp load

Inductive Load

Inductive loads consist e.g. of relay, contactors, solenoid valves, motors, electric engines,

etc.

WAR I G: Voltage spikes at shut down (up to 10 times of nominal voltage)

Protective measures: (examples)

(Flyback diode, e.g. type 1 4007)

Capacitive Load

Capacitive loads consist e.g. of long connection cables or capacitive consumers.

WAR I G: High current spikes at switching on (this will exceed the nominal current)

Protective measures: (examples)

Limitation of current by a resistor

DS08 Instruction manual 03/2020 page 7

Lamp Load

Lamp loads consist e.g. by light bulbs, starting motors .

WAR I G: High current spikes at switching on, because the glowing spiral has low

resistance at low temperature.

Protective measures: (examples)

Limitation of current by a resistor

or preheating of the glowing

spiral.

Connecting to a PLC

There is no need for protective measures by connecting the Reed switch to a PLC. The

Reed contacts are plated by Tunsten, Gold, and Rhodium located in a protective atmo-

sphere. They can be directly connected to the input terminals of a PLC without problems.

RC-Circuits as protective measures (Boucherot cell Snubber)

In practice the following values of resistor/capacitor cells give good results. evertheless,

the values given in the following tables are only recommendations for general purposes.

But it cannot be guaranteed that for specific applications more adequate Boucherot cells

may exist.

For Reed switches o 10 – 40 VA

Voltage [V] Resistance [Ohm] Capacitance [nF]

230 1500 330

115 470 330

48 220 330

24 100 330

For Reed switches o 40 – 100 VA

Voltage [V] Resistance [Ohm] Capacitance [nF]

230 1000 330

115 470 330

48 100 330

24 47 330

DS08 Instruction manual 03/2020 page 8

Electrical connection

The switch contacts employed in these devices are potential free and do not require a

power source.

Note:

Switch contacts and flow monitor have been optimally harmonized. After replacement of a

switch contact, the switch point must be readjusted.

The contacts open/change when the flow rate falls below the set value.

Grounding o the device:

When installing the device in a pipeline, make sure that the device is grounded via the

pipeline. This prevents dangerous potential differences from occurring

Switching capacity of contacts:

Contact rating

Type Size Contact unction Angle plug IP65 M12x1 plug IP67** Cable connection (1 m) IP67

DS08.M 1/2“ 1 = /O 230 V / 3 A / 60 VA 125 V / 3 A / 60 VA 230 V / 3 A / 60 VA

2 = SPDT 250 V / 1,5 A / 50 VA,

min load: 3 VA

125 V / 1,5 A / 50 VA,

min load: 3 VA

-/-

2X = SPDT for SPS 250 V / 1 A / 60 VA -/- -/-

3SM = Ex- /O* gas: < 30 V / 0,101 A / 0,76 W

dust: < 30 V / 0,25 A / 0,75 W

gas: < 30 V / 0,101 A / 0,76 W

dust: < 30 V / 0,25 A / 0,75 W

3UM = Ex-SPDT* -/-

DS08.S 1/4“

1/2“

3/4“

1“

1 = /O 250 V / 3 A / 100 VA

2 = SPDT 250 V / 1,5 A / 50 VA, min load: 3 VA

2X = SPDT for SPS 250 V / 1 A / 60 VA -/- -/-

3ST5 = Ex- /O, T5*

3ST6 = Ex- /O, T6*

-/- -/- 250 V / 2 A / 60 VA (2 m

cable)

3UT5 = Ex-SPDT, T5*

3UT6 = Ex-SPDT, T6*

-/- -/- 250 V / 1 A / 30 VA,

min load: 3 VA (2 m cable)

* Exact max. switching capacity: see ATEX documents

** Safety class M12x1 plug fo DS08.M: IP65

DS08 Instruction manual 03/2020 page 9

Contacts for DS08.M

Switching contact with connector acc. to EN 175301-803:

Normally Open (NOC) Change Over (COC)

Switch position under no-flow condition Switch position under no-flow condition

The ground-pin is not used The ground-pin is not used

DS08 Instruction manual 03/2020 page 10

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