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Elster Messtechnik GmbH, Otto-Hahn-Straße 25, 68623 Lampertheim
Tel: +49 (0) 6206 933 0, Fax: +49 (0) 6206 933 100, www.elstermesstechnik.com
Artikel-Nr. 0080141141 - 2011-03-02 (F90S_M_09.01e/03.11)
10 Interfaces and Options
10.1 Optical (infrared) interface
In order for a PC to be able to communicate with a
F90S
-instru-
ment, it is necessary to connect an optocoupler to the
corresponding interface of the PC. The optocoupler and the
necessary software are available as options.
The optical infrared interface is activated with the key.
If within 60 seconds neither a valid telegram is received nor the
key pressed again, then the interface is deactivated.
10.2 M-bus
An M-bus interface is also available on request.
It is important to ensure that the structure of the bus network
(length of connecting cables, cable diameter) corresponds to
the baud rate (2400 Bd) of the instrument connecte.
The M-bus protocol complies with standard EN 13757-2,
EN 13757-3, EN 1434-3, with the M-bus Recommendation
(version 4.8 dated Nov. 1997), standard ICE870 ports 1,2 and 4.
During communication with a heat meter via M-bus the other
instrument interfaces (key, opto head) cannot be used.
Note
:
•
Each end instrument is only protected against high voltage up
to the maximal allowed bus voltage (±50V). Additional protecti-
ve measures must be provided by the level converter.
•
In a 250-slave M-bus network (maximum 250 heat meters),
24 requests per day are possible for each meter. If fewer
requests are made and/or fewer heat meters are connected
to the bus, the unused amount of available requests is stored
in the instrument (max. amount: 300 requests).
•
The installation of an instrument in an M-bus network may
only be carried out by authorized, quali
fi
ed technical
personnel.
Recommended cable type:
Telephone cable J-Y(ST) Y2 x 2 x 0,8 mm
2
10.3. Pulse output (potential-free)
The potential-free pulse output available as a built-in
option (state when ordering) of the F90S is an electronic switch
for
fl
exible use (class A0 according to EN1434), which outputs the
counting pulses of the heat meter.
The pulse output closes corresponding to the pulse value (see the
identi
fi
cation plate on the instrument). As long as the nominal and
boundary values of the contact are taken into consideration, the
user is free to de
fi
ne his contact data within a wide range. A wide
variety of data acquisition instruments can be connected to the
contact outputs.
The pulse value is indicated on the instrument.
Pulse value:
Heat: 1kWh/Imp or optional
Volume: 100 L/Imp
Details Flow sensor
0.6
1.5
2.5
Nominal
fl
ow q
p
m³/h
0.6
1.5
2.5
Max.
fl
ow
m³/h
1.2
3.0
5.0
Pressure drop
∆
p at q
p
mbar
160
196
165
Max.
fl
ow K
V
at
∆
p
= 1 bar (Important: Not
permissible in operation!)
m
3
/h
1.5
3.5
6.3
Pressure drop MAP/PN
bar
16
Low
fl
ow
threshold
horizontal
l/h
3,5
7
10
vertical
4
7
10
External thread
G3/4B
G1B
Installation lenght
mm
110
130
Temperature range
°C
15 ... 90
Mounting position
horizontal; vertical
Color code
(Sen)
blue
red
black
Details Temperature sensors
Type PT500
platinum precision resistor
Connection
2 wire technique
Diameter
mm
5.0 (optional 5.2)
Length of connecting
cables
m
1.5 (optional 3.0)
9 Error Codes
When the instrument detects an error, the error symbol
and number are displayed.
The error can also be displayed by selecting the menu
item 8) ‘error display’ in the
fi
rst level / main loop (see
no. 7. Display).
There are seven possible causes of error, and they can appear in
combination with each other, depending on the situation.
The discription of the faults can you see over the display.
Example: Scanning coil fault
Error
Errorcode
Binary display
LCD
electronic fault
electronic fault
Reset
RF sensor fault
scanning coil fault
VF sensor fault
Errorcode
hexadecimal
( LCD)
When an error occurs in the
standard display
(Total heat
energy), with the exception of the „reset“ error, the instrument
must be exchanged and sent to the manufacturer for examination.
Pulse output:
Max. switching current (peak)
300 mA ~/-
Max. switching voltage
35 V ~/-
Max. switching power
300 mW
Insulation resistance
> 10
09
Ohm
Contact resistance
max. 25 Ohm
Contact capacity
1.5 pF
Maximum current
120 mA
Dielectric strength (open contact)
350 V ~/-
Closing time
125 ms
Distance between pulse
125 ms
Display
binär
Description
Display
hexadecimal
1 at 1st position
electronic fault
error 40
1 at 2nd position
electronic fault
error 20
1 at 3rd position
Reset
error 10
1 at 4th position
scanning coil fault
error 08
1 at 5th position
electronic fault
error 04
1 at 6th position
RF-sensor fault
error 02
1 at 7th position
FF-sensor fault
error 01
electronic fault