Kobold ZOK-E1 Istruzioni operative
Supplementary Operating Instructions
For
Flow rate Controller/
Dosing Unit/Flow Counter
Model: ZOK-E1/E2/E3/E4/E5
ZOK-Ex
page 2 ZOK-Ex K01/0217
We don’t accept warranty and liability claims neither upon this publication nor in
case of improper treatment of the described products.
The document may contain technical inaccuracies and typographical errors. The
content will be revised on a regular basis. These changes will be implemented in
later versions. The described products can be improved and changed at any time
without prior notice.
© Copyright
All rights reserved.
1. Contents
1. Contents........................................................................................................2
2. General .........................................................................................................3
3. Conforming Standards ..................................................................................3
4. Overview .......................................................................................................4
5. Mechanical Installation (also refer to ZOK-Zx series Instruction manual) .....4
6. Electrical Installation .....................................................................................5
7. Wiring..........................................................................................................12
8. Programming ..............................................................................................12
9. Service ........................................................................................................12
10.Repair .........................................................................................................13
11.Label and ordering code .............................................................................13
12.Replacement ATEX Battery ........................................................................14
13.EU Declaration of Conformance..................................................................17
14.Exi Certificate ..............................................................................................18
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: +49(0)6192-2990
Fax: +49(0)6192-23398
E-Mail: [email protected]
Internet: www.kobold.com
ZOK-Ex
ZOK-Ex K01/0217 page 3
2. General
These instructions must be read in addition to the ZOK-Zx Instruction Manual (or
to the manual of the KOBOLD flowmeter, where the “ZOK-ExM” instrument is
mounted), if you have purchased an ATEX I.S. certified ZOK-Ex series instrument
and intend installing it in a hazardous environment for which it is approved.
The I.S. certified instrument may be stand alone (ZOK-Ex) or fitted to a KOBOLD
flowmeter with pulse sensor (*Ex*).
3. Conforming Standards
The I.S. Ex/ZOK-Ex series instruments are certified in accordance with the ATEX
directive. Prior to installation, review the certification marking on the instrument
label to confirm if it is appropriately certified for your region, suits the site
classification and complies with your hazardous area philosophy.
ATEX Directive
Complies with ATEX directive 2014/34/EC
Conforms to Standards: See certificate
Instruments have also been assessed against the Essential Health and Safety
requirements (ESHR’s) as defined in European Directive 2014/34/EU for
II 2 G.
The instruments are certified for “ia” (intrinsically safe) protection suitable for gas
group IIB and temperature class T1 to T4 in an ambient temperature of -20 to +60
deg C and are suitable for installation in Group II, Zone 1 and 2 areas.
The instruments have also been tested to IEC60529 and comply with a protection
rating of IP66/67.
ZOK-Ex
page 4 ZOK-Ex K01/0217
4. Overview
The certified ZOK-Ex series is an I.S. indicator providing a display of flowrate,
accumulated total and resettable total. It can be loop powered, battery powered
and/or dc powered via an approved associated apparatus such as an I.S. isolator.
In addition, when externally powered the certified ZOK-Ex series (not ZOK-E1)
provides one or two outputs (depending on model and configuration).
Dosing unit with one or two stage dosing using one or two opto-coupler outputs
with switching function (model ZOK-E2)
Loop Powered 4-20 mA output proportional to flow rate (model ZOK-E3/E4)
The optional alarm and/or pulse outputs must be driven each by a separate
associated device:
Low flow and high flow rate alarm (model ZOK-E5)
Scaled pulse output for remote totalisation (model ZOK-E5)
Note: ZOK-Ex electronics is not available with display backlight.
5. Mechanical Installation (also refer to ZOK-Zx series Instruction
manual)
There are additional installation requirements to the Instruction Manual for
certified ZOK-Ex series instruments in accordance with the ESHR’s as defined in
annex II of the ATEX directive 2014/34/EU.
The ambient temperature must be within the limits -20 to +60 °C.
The instruments must be installed to prevent mechanical and thermal stresses
and to prevent an attack from existing or foreseeable aggressive substances.
The instrument case is not considered to be an electrostatic risk, however
the equipment must not be installed in a position where it may be subjected
to an excessive air flow or subjected to rubbing that may cause an
electrostatic build up. In addition the instrument shall only be cleaned with
a damp cloth.
In all installations appropriate local rules, regulations and directives governing
instrument selection, installation practices and requirements must be followed.
ZOK-Ex
ZOK-Ex K01/0217 page 5
6. Electrical Installation
Power supply options:
Most units can be driven through 3 different power options. The software of the
ZOK-Ex units detects the power mode and enables / disables corresponding hard-
and software functions.
a. Battery powered (using intrinsically safe ATEX Battery-see Section 12):
No electrical outputs, only unpowered sensors can be used (reed switch
and induction coil sensor). This power option can only be used with ZOK-
E1 and ZOK-E3).
b. External supply (powered by associated intrinsically safe power supply).
Powered or unpowered certified pulse sensors can be applied (hall sensor,
reed switch, NAMUR proximity sensor, induction coil).
Electrical output 4-20mA (3-wire, ZOK-E3/ZOK-E4) or pulse output/switch
output (ZOK-E5) or switching outputs for dosing (ZOK-Z2) can be used.
c. External loop powered 4-20mA (2-wire, passive, powered by associated
intrinsically safe 4-20mA-transmitter). Only unpowered certified sensor can
be connected (reed switch and induction coil). This power mode can be
used with ZOK-E3 units.
d. External loop powered 4-20mA with HART protocol option. Same as c.)
Including HART protocol functionality (ZOK-E4 units).
Input sensor options:
a. Unpowered inputs:
Reed switch inputs are defined as simple apparatus under the ATEX directive.
A reed switch input can be wired directly into the ZOK instrument without
further certification.
ZOK-Ex
page 6 ZOK-Ex K01/0217
b. Self exciting inputs:
Non-amplified Pick off coils from turbine meters are examples of this type of input.
Pick-off coils must be I.S. certified and the entity parameters of the coil must not
be less than the entity parameters of the ZOK-Ex instrument being:
Vi = 28 VDC, Ii = 100 mA, Pi = 0.7 W
c. Inputs requiring power from the ZOK-Ex instrument:
Examples of this type of sensor are open collector output from a hall Sensor, pre-
amplified coils from turbine meters or Namur proximity sensors. Examples are
where the voltage required to power the sensor originates from the associated
apparatus via the ZOK-Ex instrument. These sensors must be certified and the
entity parameters of the sensor must not be less than the entity parameters of the
ZOK-Ex instrument being:
Vi = 28 VDC, Ii = 100 mA, Pi = 0.7 W
The power to the ZOK-Ex instrument must come from a certified source
(commonly known as associated apparatus). The entity parameters of the
associated apparatus must not exceed those of the ZOK-Ex instrument being:
Vi = 28 VDC, Ii = 100 mA, Pi = 0.7 W
ZOK-Ex
ZOK-Ex K01/0217 page 7
d. Other inputs:
The ZOK-Ex units can also accept isolated pulse/frequency outputs from a
powered device such as an open collector or voltage free contact from a mass
or electromagnetic flowmeter. These devices must be appropriately certified
and the pulse/frequency output must be galvanic isolated and have certified
entity parameters not less than the entity parameters of the ZOK-Ex instrument
being:
Vi = 28 VDC, Ii = 100 mA, Pi = 0.7 W
ZOK-Ex
page 8 ZOK-Ex K01/0217
ZOK-Ex
ZOK-Ex K01/0217 page 9
Outputs (only ZOK-E2/E3/E4/E5):
The ZOK-Ex instruments (except ZOK-E1) are certified to provide one (two) of
the outputs i.e. Analogue, switching or pulse. To obtain an output, external
power is required to be sourced from a certified associated apparatus located
in the safe area. In all cases the entity parameters of the associated apparatus
must not exceed those of the ZOK-Ex series instrument being:
Vi = 28 VDC, Ii = 100 mA, Pi = 0.7 W
1. Two wire 4-20 mA loop powered output (ZOK-E3/E4):
The ZOK-Ex instrument can be powered from a two wire 4-20 mA loop, if the
input sensor requires no power from the ZOK-Ex instrument (reed switch or
certified induction coil sensor).
ZOK-Ex
page 10 ZOK-Ex K01/0217
2. Three wire 4-20mA output (ZOK-E3/E4):
The ZOK-Ex instrument can be powered in a three wire 4-20 mA configuration,
if the input sensor requires power from the ZOK-Ex instrument.
3. Dosing function/Pulse or flow alarm ouputs (ZOK-E2/E5):
For ZOK-E2/E5 units the electronic assembly is equipped with an additional
opto-coupler board. This board provides 3 isolated passive opto-coupler outputs
for low flow / high flow alarm outputs and pulse output.
In this arrangement the switch outputs / pulse output connectors are electrically
separated.
Altri manuali per ZOK-E1
1
Questo manuale è adatto per i seguenti modelli
4
Indice
Altri manuali Kobold Controllori
