Kobold ZFC User manual

Operating Instructions
for
Differential Flow Computer
Model: ZFC

ZFC
page 2 ZFC K03/0522
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.Note .............................................................................................................. 4
3.Instrument Inspection .................................................................................... 4
4.Regulation Use ............................................................................................. 4
5.Operating Principle ........................................................................................ 5
5.1Functions and features ......................................................................... 5
6.Operation ...................................................................................................... 7
6.1Control panel ....................................................................................... 7
6.2Operator Information and functions ..................................................... 8
7.Configuration ................................................................................................. 9
7.1How to program the ZFC ................................................................... 10
8.Installation ................................................................................................... 24
8.1General directions .............................................................................. 24
8.2Installation / Surrounding conditions .................................................. 24
8.3Installing the hardware ....................................................................... 25
9.Problem solving ........................................................................................... 33
10.Communication ........................................................................................... 34
11.List of configuration settings ........................................................................ 40
12.Maintenance ............................................................................................... 41
12.1General directions .............................................................................. 41
12.2Instructions for repair ......................................................................... 42
13.Technical Data ............................................................................................ 43
14.Order Codes ............................................................................................... 45
15.Dimensions ................................................................................................. 46
16.EU Declaration of Conformance ................................................................. 47

ZFC
ZFC K03/0522 page 3
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com
Hardwareversion : 03.01.xx
Softwareversion : 03.01.xx

ZFC
page 4 ZFC K03/0522
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
The instruction manuals on our website www.kobold.com are always for currently
manufactured version of our products. Due to technical changes, the instruction
manuals available online may not always correspond to the product version you
have purchased. If you need an instruction manual that corresponds to the
purchased product version, you can request it from us free of charge by email
([email protected]) in PDF format, specifying the relevant invoice number and
serial number. If you wish, the operating instructions can also be sent to you by
post in paper form against an applicable postage fee.
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.
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:
 Differential Flow Computer model: ZFC
4. Regulation Use
Any use of the Differential Flow Computer, model: ZFC, 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.

ZFC
ZFC K03/0522 page 5
5. Operating Principle
5.1 Functions and features
The flow computer, model ZFC is a microprocessor driven instrument for the
calculation of differential flow measurement applications using flow equations
for liquids. This product has been designed with a focus on:
 two multi-purpose pulse inputs;
 several mounting possibilities with aluminum or GRP enclosures
for harsh industrial surroundings;
 ability to process all types of flowmeter signals;
 transmitting possibilities with analog / pulse and communication outputs.
Flowmeter and temperature input
This manual describes the unit with a pulse input from the flowmeter. The ZFC
has also a PT100 temperature input. Other versions are available to process
(0)4-20 mA signals. Two flowmeters with a passive or active pulse, Namur or
sine wave (coil) signal output can be connected to the ZFC. To power the
sensor, several options are available.
Standard output
 Pulse output to transmit a pulse that represents a totalized quantity as
programmed.
 Linear 4-20 mA analog output to represent the actual calculated differential
flow rate as programmed. The 4-20 mA signal limits can be tuned.
Typical application

ZFC
page 6 ZFC K03/0522
Configuration
The ZFC is designed for use in many types of applications. For that reason, a
setup menu is available to program the ZFC according to your specific
requirements.
The setup includes several important features, such as K-Factors, engineering
units, signal selection, etc. All settings are stored in a non- volatile memory and
therefore kept in the event of a power failure.
Display information
The unit has a LCD with (optional) backlight to show the process information,
status and alarm messages. The display refresh rate is programmed in the setup
menu.
At a key press, the display refresh rate will switch to FAST for 30 seconds. When
'OFF' is selected, the display goes off after 30 seconds after the last key press.
The display temporarily comes on after
a key press.
A backup of the total and accumulated total in EEPROM memory is made every
minute.
Backlight
A backlight is available as an option. The brightness can be tuned as desired.
Options
The following options are available: active (0)4-20 mA analog output, full
Modbus
communication RS485, mechanical relay or active output, power- and
sensor-supply options, extended measurement range for PT100, wall-mount
and weather-proof enclosures and LED backlight.

ZFC
ZFC K03/0522 page 7
6. Operation
 This device may only be operated by persons who are authorized and
trained by the operator of the facility. All instructions in this manual are
to be observed.
 Take careful notice of the "Safety rules, instructions and precautionary
measures" in the front of this manual.
This chapter describes the daily use of the ZFC. This instruction is meant for
users / operators.
6.1 Control panel
The control panel has three keys. The available keys are:
Control panel
Functions of the keys
This key is used to program and save new values or settings.
The PROG/ENTER key is also used to gain access to the setup menu
(read chapter 7).
This key is used to select the accumulated total and temperature.
The SELECT/ key is also used to increase a value after the
PROG/ENTER key has been pressed (read chapter 7).
This key is used to reset the total.
The CLEAR/ key is also used to select a digit or an option after the
PROG/ENTER key has been pressed (read chapter 7).

ZFC
page 8 ZFC K03/0522
6.2 Operator Information and functions
In general, the ZFC operates in the
operator mode. The shown information
depends on the settings which are made
in the setup menu.
The signal from the connected sensor is
processed by the ZFC in the background,
independent from the selected display
refresh rate.
For the Operator, the following functions are available:
 Display calculated differential flow rate and calculated differential total
This is the main display information of the ZFC. After the selection of any other
information, it
will always return to this main display automatically. Total is shown
on the upper line of the
display and flow rate on the bottom line. When selected in
the setup menu, the display shows the flow rate only. If you press the select key,
the total shows momentarily.
When "-------" is shown, then the flow rate value is too high to be shown. The
arrows  indicate the increase/decrease of the flow rate trend. If the consumption
is very low, it might be that a stable low flow rate and total is shown; this is due to
the settings of the ZFC.
 Clear total
The value for total can be reset. To do so, press the CLEAR/ key twice. When
the key is pressed once, the text "PUSH CLEAR" is shown. To avoid a reset at this
stage, press another key other than the CLEAR/ key or wait for 20 seconds. A
reset of the total does not influence the accumulated total.
Type IB: When a Normally Closed (NC) contact is used, the local clear total
function is disabled and a clear total is only possible with the external
reset command.
 Display calculated differential accumulated total
When the SELECT/ key is pressed, total and accumulated total are shown. The
accumulated
total cannot be reset. The value will count up to 99,999,999,999. The
unit and number of
decimals are shown according to the settings for the total.
 Display line temperature and calculated flow rate INLET / OUTLET
When the SELECT/ key is pressed twice, the actual INLET / OUTLET
temperature is shown at the top line of the display. At the bottom line, the
calculated INLET / OUTLET flow rate is shown
together with the engineering units
for flow rate and temperature
 Range error
As soon as the input value is out of the calibrated PT100 measurement range, the
alarm indicator shows. When the SELECT/key is pressed a few times, the alarm
code is shown in the alarm display. This alarm is also activated at a wire break or
faulty sensor.
(standard range -100°C - +200°C or extended range, type ZV: -200° - +800°C).
Alarm
When the alarm indicator is shown, refer to chapter 9: Problem Solving.
RU
N
Process information (typical)

ZFC
ZFC K03/0522 page 9
7. Configuration
This and the following chapters are exclusively meant for electricians and non-
operators. In these, an extensive description of all software settings and
hardware connections are provided.
 Mounting, electrical installation, start-up and maintenance of this device
may only be carried out by trained persons authorized by the operator of
the facility. Persons must read and understand this manual before
carrying out its instructions.
 This device may only be operated by persons who are authorized and
trained by the operator of the facility. All instructions in this manual are to
be observed.
 Make sure, the measuring system is correctly wired up according to the
wiring diagrams. Protection against accidental contact is no longer
assured when the housing cover is removed or the panel cabinet has
been opened (danger from electrical shock). The housing may only be
opened by trained persons authorized by the operator of the facility.
 Take careful notice of the "Safety rules, instructions and precautionary
measures" in the front of this manual.
The SETUP menu is used to program the ZFC
The SETUP menu is accessible at all times while the ZFC remains fully
operational. Be aware that in this case any change to the settings may have an
influence on the operation.
It is possible to prevent access to the SETUP menu with a password. A
password may be required to enter the SETUP menu. Without this
password, access to SETUP is denied.

ZFC
page 10 ZFC K03/0522
7.1 How to program the ZFC
How to enter the setup menu
When the setup menu is protected by a password, the ZFC asks for a password
to access the setup menu. When in the operator mode, press and hold the
PROG/ENTER key for 7 seconds to access the setup menu.
How to navigate in the setup menu
The setup menu has different submenus to program the ZFC. For navigation, the
submenus and the settings are identified with numbers (for the submenu: e.g. 1;
for the setting: e.g. 12.). The CLEAR/► key and the PROG/ENTER key are used
for navigation. The explanation assumes that you are in the submenu TOTAL.
Action Result Remark
Press the CLEAR/► key to
select the next submenu
 The submenu FLOW
RATE is displayed.
Press again to go to the
next submenu.
 The submenu DISPLAY
is displayed.
Momentarily, press the
PROG/ENTER key to select
the previous submenu.
 The submenu FLOW
RATE is displayed.
The PROG/ENTER key is
used as a ◄ key.
Press again to go to the
previous submenu.
 The submenu TOTAL is
displayed.
The PROG/ENTER key is
used as a ◄ ke
y
.
The SELECT/▲ key and the CLEAR/► key are used for navigation.
The explanation assumes that you are in the submenu TOTAL. When you are:
 in the first setting and you navigate to the previous setting, the ZFC goes back
to the related main menu.
 in the last setting and you navigate to the next setting, the ZFC goes to the
related main menu.
The setup menu has different
submenus. Each submenu has an
unique number which is shown in
front of the menu name.
Each setting has an unique two-
digit number which is shown in
front of the setting. The first digit
refers to the submenu and the
second digit refers to the setting.
Note that sometimes the name of
the setting is shown on the upper
line of the display.

ZFC
ZFC K03/0522 page 11
How to make a setting
Changes are only saved if you press the PROG/ENTER key.
The explanation assumes that you are in the submenu TOTAL and the setting UNIT.
If you do not want to save the change, wait for approximately 20 seconds or press
and hold the PROG/ENTER key for approximately 3 seconds.

ZFC
page 12 ZFC K03/0522
7.1.1 SETUP MENU - SETTINGS
1 TOTAL-A
11 unit L; m3; kg; lb; GAL; USGAL; bbl; no unit
12 decimals 0000000; 111111.1; 22222.22; 3333.333
13 K-factor 0.000010 - 9999999
14 decimals K-factor 0 - 6
2 FLOW RATE-A
21 unit mL; L; m3; mg; g; kg; ton; gal; bbl; lb; cf; rev; - - - - (no unit); scf; nm3; nL; p
22 time /sec; /min; /hour; /day
23 decimals 0000000; 111111.1; 22222.22; 3333.333
24 K-factor 0.000010 - 9999999
25 decimals K-factor 0 - 6
26 filter 0 - 99
27 period 0.1 - 99.9 seconds
3 TOTAL-B
31 K-factor: 0.000010 - 9999999
32 decimals K-factor 0 - 6
4 FLOW RATE-B
41 K-factor 0.000010 - 9999999
42 decimals K-FACTOR 0 - 6
5 DISPLAY
51 function total; rate
52 light 0% (off); 20%; 40%; 60%;- 80%; 100% (full brightness)
53 measurement bi-direct; not negative; threshold; stationary
54 stationary flow rate 0000.000 - 9999999
55 stationary total 0000.000 - 9999.999
6 POWER MANAGEMENT
61 LCD new fast; 1 sec; 3 sec; 15 sec; 30 sec; off
7 FLOWMETER
71 signal A npn; npn-lp; reed; reed-lp; pnp; pnp-lp; namur; coil-hi; coil-lo; 8-1 DC;
12 DC; 24 DC
72 signal B npn; npn-lp; reed; reed-lp; pnp; pnp-lp; namur; coil-hi; coil-lo; 8-1 DC;
12 DC; 24 DC
8 TEMPERATURE A/B
81 display °C; °F; K
82 no. of wires 2; 3
83 filter 01 - 99
9 FORMULA
91 equations type EL (fixed)
92 thermal expansion coefficient 0.000000 - 9.999999 (*10-3/K)
93 normal temperature 0.00 - 99,999.99 K

ZFC
ZFC K03/0522 page 13
A ANALOG
A
1 output disable; enable
A
2 rate-min 000.000 - 999999
A
3 rate-max 000.000 - 999999
A
4 cut-off 0.0 - 9.9%
A
5 tune-min 0 - 9999
A
6 tune-max 0 - 9999
A
7 filter 01 - 99
B P ULSE
B1 mode signed; not negative; separated
B2 width 0.001 – 9
B3 decimals 0000000; 111111.1; 22222.22; 3333.333
B4 amount 0.001 – 9999999
C COMMUNICATION
C
1 speed 1200; 2400; 4800; 9600
C
2 address 1 - 247
C
3 mode bus-rtu; bus-asc; off
D OTHERS
D
1 model ZFC
D
2 software version nn:nn:nn
D
3 serial no. nnnnnnn
D
4 password 0000 - 9999
D
5 tag-nr 0000000 - 9999999

ZFC
page 14 ZFC K03/0522
7.1.2 EXPLANATION OF SETUP-MENU 1 - TOTAL-A
1 TOTAL-A
11 unit This setting is used to select the engineering unit for the indication of the total (A
and B), the accumulated total (A and B), and the pulse output.
When you change the engineering unit, you must recalculate and
reprogram the K-factor for the (accumulated) total. When you
recalculate and reprogram the K-Factor, the history for
(accumulated) total is not correct anymore, because the
(accumulated) total is not recalculated. For future reference, best
practice is to make a note of the accumulated total before you
program the recalculated K-Factor.
12 decimals This setting is used to set the amount of digits behind the decimal point for the
(accumulated) total indication (A and B).
13 K-factor This setting is used to set the K-Factor for the total (A). With the K-Factor, the
flowmeter pulse signals are converted to a quantity. The K-Factor is based on the
number of pulses generated by the flowmeter per selected engineering unit, for
example per m3. A more accurate K-Factor (more decimals, as set in decimals
K-Factor) allows for a more accurate operation of the system.
Example 1: Calculating the K-Factor.
The flowmeter generates 2.4813 pulses per liter and the selected unit is m3. A
cubic meter consists of 1000 liter which gives 2.4813 pulses*1000 liter=2481.3
pulses per m3. So, the K-Factor is 2481.3. Enter for the Flowmeter K-Factor:
24813 and for the flowmeter K-Factor decimals: 1.
Example 2: Calculating the K-Factor.
The flowmeter generates 6.5231 pulses per gallon and the selected engineering
unit is gallons. So, the K-Factor is 6.5231. Enter for the Flowmeter K-Factor:
65231 and for the Flowmeter K-Factor decimals: 4.
When you recalculate and reprogram a new K-Factor, the history for
(accumulated) total is not correct anymore, because the
(accumulated) total is not recalculated. For future reference, best
practice is to make a note of the accumulated total before you
program the recalculated K-Factor.
14 decimals K-factor This setting is used to set the amount of digits behind the decimal point for the
K-Factor (A).

ZFC
ZFC K03/0522 page 15
7.1.3 EXPLANATION OF SETUP-MENU 2 - FLOW RATE-A
The settings for total and flow rate are entirely separate. In this way, different
engineering units can be used for each e.g. cubic meters for total and liters for flow
rate.
2 FLOW RATE-A
21 unit This setting is used to select the engineering unit for the indication of the flow
rate (A and B).
Alteration of the engineering unit will have consequences for
operator and setup values, they will not be automatically
recalculated to the value of the new selected unit. The K-Factor has
to be adapted as well; the calculation is not done automatically.
22 time This setting is used to set the time unit for the flow rate calculation (A and B).
Note that the flow rate is given in engineering unit/time unit, e.g. liters/minute
(l/min).
When you change this setting, also recalculate and change the settings
for the analog rate-min and analog rate-max.
23 decimals This setting is used to set the amount of digits behind the decimal point for the
flow rate indication (A and B).
24 K-factor This setting is used to set the K-Factor for the flow rate (A). With the K-Factor, the
flowmeter pulse signals are converted to a quantity. The K-Factor is based on
the number of pulses generated by the flowmeter per selected engineering unit,
for example per m3. A more accurate K-Factor (more decimals, as set in decimals
K-Factor) allows for a more accurate operation of the system.
25 decimals K-factor This setting is used to set the amount of digits behind the decimal point for the
K-Factor (A).
26 filter This setting is used to stabilize the output signal. With the help of this digital filter
a more stable but less actual representation of the flow rate can be obtained.
The filter principal is based on three input values: the filter level (01-99), the last
calculated flow rate and the last average value. The higher the filter level, the
longer the response time on a value change will be.
filter value RESPONSE TIME ON STEP CHANGE OF ANALOG VALUE.TIME IN SECONDS
influence
01
02
03
05
10
20
30
50
75
99
50%
filter disabled
1.1 sec
1.2 sec
0.4 sec
0.7 sec
1.4 sec
2.1 sec
3.5 sec
5.2 sec
6.9 sec
75%
filter disabled
0.2 sec
0.4 sec
0.7 sec
1.4 sec
2.8 sec
4.0 sec
7.0 sec
10 sec
14 sec
90%
filter disabled
0.4 sec
0.6 sec
1.1 sec
2.2 sec
4.5 sec
7.0 sec
11 sec
17 sec
23 sec
99%
filter disabled
0.7 sec
1.2 sec
2.1 sec
4.4 sec
9.0 sec
14 sec
23 sec
34 sec
45 sec
27 period
This setting is used to calculate the flow rate by counting the number of pulses
within a certain time, for example 1 second. The longer the time the more
accurate the flow rate will be.
 This setting does influence the update time for the analog output directly. If the
output response is too slow, decrease the number of pulses.
 The shorter the updatetime, the higher the power consumption of the unit will
be.

ZFC
page 16 ZFC K03/0522
7.1.4 EXPLANATION OF SETUP-MENU 3 - TOTAL-B
The engineering units are the same as used in SETUP-menu 1 - Total-A.
3 TOTAL-B
31 K-factor This setting is used to set the K-Factor for the total (B). With the K-Factor, the
flowmeter pulse signals are converted to a quantity. The K-Factor is based on the
number of pulses generated by the flowmeter per selected engineering unit, for
example per m3. A more accurate K-Factor (more decimals, as set in decimals
K-Factor) allows for a more accurate operation of the system.
32 decimals K-factor This setting is used to set the amount of digits behind the decimal point for the
(accumulated) total indication (B).
7.1.5 EXPLANATION OF SETUP-MENU 4 - FLOW RATE-B
The engineering units are the same as used in SETUP-menu 2 - Flow rate-A.
4 FLOW RATE-B
41 K-factor This setting is used to set the K-Factor for the flow rate (B). With the K-Factor, the
flowmeter pulse signals are converted to a quantity. The K-Factor is based on the
number of pulses generated by the flowmeter per selected engineering unit, for
example per m3. A more accurate K-Factor (more decimals, as set in decimals
K-Factor) allows for a more accurate operation of the system.
42 decimals K-factor This setting is used to set the amount of digits behind the decimal point for the
K-Factor (B).

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ZFC K03/0522 page 17
7.1.6 EXPLANATION OF SETUP-MENU 5 - DISPLAY
5 DISPLAY
51 function This setting can be set to display total or rate.
 When 'total' is selected, simultaneously, total is shown with the large digits and
flow rate with the smaller digits. When SELECT is pressed, the accumulated
total is shown temporarily.
 When 'rate' is selected, only flow rate will be shown with the large digits
together with its measuring unit. When SELECT is pressed, the total and the
accumulated total are shown temporarily.
52 light The backlight brightness can be adjusted from 0% (off) to 100% (full brightness)
in steps of 20%.
When the ZFC is only loop powered, the backlight is disabled. An external
power supply is required to supply the backlight.
53 measurement To solve undesired display readings during low or even negative consumption
situations, four different measurement methods have been implemented. Note
that the selection does influence the analog output value (ref. flow rate) as well.
bi-directional
Shown flow rate: positive and negative.
Shown total: increases or decreases.
not negative
Shown flow rate: only positive or zero.
Shown total: increases or decreases.
threshold
Shown flow rate: as soon as the flow rate is lower than SETUP 54 or negative,
zero flow rate is shown.
Shown total: as soon as the flow rate is lower than SETUP 54 or negative,
totalization will stop.
stationary
Shown flow rate: as soon as the flow rate is lower than SETUP 54 or negative,
the stationary flow rate (SETUP 54) is shown.
Shown total: as soon as the flow rate is lower as SETUP 54 or negative,
stationary totalization (SETUP 55) will be activated. However, if the value of
54 stationary
flow rate
threshold
stationary
Enter here the flow rate according SETUP 53: threshold or stationary. The time
and measuring units are according to flow rate SETUP 21 and 22.
Flow rate zero is shown as soon as the flow rate will be lower as this setting.
As soon as the flow rate is lower as this setting, this flow rate is shown.
If the flowmeters do not generate pulses, the flow rate shows zero.
55 stationary
total
Enter here a flow rate per hour according to SETUP 53 –‘stationary’. The
measuring unit is according to TOTAL (A and B) - SETUP 11.
This flow rate is converted to a total which will be used as long as the flow rate
is lower as SETUP 54.
 If the flowmeters do not generate pulses, the totalization will stop.
 This function is disabled if value zero has been entered.

ZFC
page 18 ZFC K03/0522
7.1.7 EXPLANATION OF SETUP-MENU 6 - POWER MANAGEMENT
When used with the internal battery option (type PB/PC), the user can expect reliable
measurement over a long period of time. The ZFC has several smart power
management functions to extend the battery life time significantly. Two of these
functions can be set.
6 POWER MANAGEMENT
61 lcd new The calculation of the display-information influences the power consumption
significantly. When the application does not require a fast display refresh rate, it is
strongly advised to select a slow refresh rate. Please understand that NO
information will be lost; every pulse will be counted and the output signals will be
generated in the normal way.
At a key press, the display refresh rate will switch to FAST for 30 seconds. When
'OFF' is selected, the display goes off after 30 seconds after the last key press.
The display temporarily comes on after a key press.
Example battery life-time with a coil pick-up:
 1kHz pulse and FAST update: about 2 years;
 1kHz pulse and 1 sec update: about 5 years.
62 battery mode The ZFC has two modes: operational or shelf.
After "shelf" has been selected, the ZFC can be stored for several years; it will not
process the sensor signal; the display is switched off but all settings and totals are
stored. In this mode, power consumption is extremely low.
To wake up the ZFC again, press the SELECT/ key two times.

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ZFC K03/0522 page 19
7.1.8 EXPLANATION OF SETUP-MENU 7 - FLOWMETER
The ZFC is able to handle several types of input signal. The pickup / signal is
selected with:
 SETUP 71 (Input A), Read also chapter 8
 SETUP 72 (Input B), Read also chapter 8.
The selection "active pulse" offers a detection level of 50% of the supply voltage.
7 FLOWMETER
71/72 SIGNAL
TYPE OF SIGNAL EXPLANATION RESISTANCE FREQ.
/
mV REMAR
K
NPN NPN input 100 kΩpull-up max. 6 kHz. (open collector)
NPN-LP NPN with low pass filter 100 kΩpull-up max. 1.2 kHz. (open collector)
less sensitive
REED Reed-switch input 1 MΩpull-up max. 600 Hz.
REED-LP Reed-with low pass filter 1 MΩpull-up max. 120 Hz. Less sensitive
PNP PNP input 100 kΩpull-down
max. 6 kHz.
PNP-LP PNP with low pass filter 100 kΩpull-down
max. 1.2 kHz. Less sensitive
NAMUR NAMUR input 820 Ωpull-down max. 4 kHz. External power
required
COIL-HI High sensitive coil input -
min. 20 mVpp Sensitive for
interference!
COIL-LO min. 80 mVpp
8-1 DC max.
10 kHz.
12 DC Active pulse input
detection level 12V DC 4 kΩmax. 10 kHz. External power
required
24 DC Active pulse input
detection level 12V DC 3 kΩmax. 10 kHz. External power required

ZFC
page 20 ZFC K03/0522
7.1.9 EXPLANATION OF SETUP-MENU 8 - TEMPERATURE A/B
8 TEMPERATURE A/B
81 display This setting is used to program the temperature unit which is shown to the operator.
This setting does not influence the actual calculations.
82 no. of wires This setting is used to program the number of wires for the PT100 sensors.
83 filter The analog output signal of a sensor represents the actual temperature. This signal is
measured several times a second. The value measured is a "snap-shot" of the real
temperature as it will be fluctuating.
With the help of this digital filter a stable and accurate reading can be obtained while the
filter level can be set to a desired value.
The filter principal is based on three input values: the filter level (01-99), the last
measured analog value and the last average value. The higher the filter level, the
longer the response time on a value change will be..
filter value Response time on step change of analog value. (Time in seconds).
influence 50% 75% 90% 99%
10 1.8 sec 3.5 sec 5.6 sec 11 sec
20 3.5 sec 7.0 sec 11 sec 23 sec
30 5.3 sec 10 sec 17 sec 34 sec
50 8.8 sec 17 sec 29 sec 57 sec
75 13 sec 26 sec 43 sec 86 sec
99 17 sec 34 sec 57 sec 114 sec
7.1.10 EXPLANATION OF SETUP-MENU 9 - FORMULA
9 FORMULA
91 equations type This setting shows the formula. The type EL stands for Equations Liquid - flow
computer for corrected liquid volume
The formula used: Qnormal = Q * (1 + (Tnormal - T)) where:
Qnormal : calculated volume at reference conditions
Q : measured volume
 : thermal expansion coefficient
Tnormal : reference temperature
T : measured temperature
92 thermal expansion
coefficient
Enter here the thermal expansion coefficient for the liquid used. The value to
be entered has to be multiplied with 1000. The decimal position is fixed but
cannot be shown: x,xxxxxx.
With the default value of 0.000000 the volume correction is disabled.
Examples: Calculation of the thermal expansion coefficient
for water is 0.00031 per K. Enter: 0310000.
for petrol is 0.00110 per K. Enter: 1100000.
93 normal temperature Enter here the reference temperature Tnormal in degrees Kelvin (K). In most
applications, the volume has to be calculated at 15°C which is 288,15 K.