Bühler technologies BPM Guía Rápida página 14

BPM
4.5.2.2 Measurement With Load Resistor
The voltage should be measured with a suitable voltmeter.
Fig. 6: Current measurement with load resistor
The ordinal numbers for the various standards are calculated
according to the following tables.
The load resistance cannot be selected arbitrarily. It must be
adjusted to the supply voltage. The maximum load resistance
can be determined using the following formula:
Or alternatively use the following table:
R /Ω
max
250
400
1000
Tab. 3: Maximum load resistance
4.5.2.3 Configuration
Which ordinal number and standard will be output via the
analog current output can be selected in the device menu un-
der "CONFIG. ANALOG".
4.5.2.4 Converting Analog Current Output To Ordinal
Number
The analog current output supplies a signal of 4 to 20 mA. The
following explains conversions into the respective ordinal
numbers.
l/mA ISO 4406:99
4 0
12 13
20 26
Tab. 4: Comparison chart current output to ordinal number ISO and
SAE
l/mA NAS 1638
4 00
12 7
13 8
14 9
15 10
16 11
17 12
20 -
Tab. 5: Comparison chart current output to ordinal number NAS and
GOST
14 Bühler Technologies GmbH
Supply voltage/V
9
12
24
SAE AS 4059E
000
5
12
GOST 17216
00
15
17
-
-
-
-
-
Standard Ordinal number formula
ISO 4406:99 1.625 ∙I / mA - 6.5
SAE AS 4059 E 0.875 ∙ I / mA - 5.5
NAS 1638 I / mA - 5
GOST 17216 2 ∙ I / mA - 9
Tab. 6: Converting ordinal numbers
4.5.2.5 Sequential Data Output For ISO 4406:99 And SAE
AS 4059E
The analog sequential data output function can be used for
standards ISO 4406:99 and SAE AS 4059E. In this case, the four
ordinal numbers are sequentially output via the analog inter-
face (4..20mA) using a set time pattern.
Each sequence starts with a 20 mA signal for 4 seconds. The
following shoes a complete output sequence with starting sig-
nal.
Sequential output is not available for NAS and GOST.
Start
Fig. 7: Sequential data output
4.5.3 Switching Inputs And Outputs
4.5.3.1 Digital Input
The digital input is required for measuring mode: Digital I/O.
Pin 5 must be connected to either L- or L+ to start and stop a
measurement.
Additional information see chapter Digital I/O.
4.5.3.2 Switching Output
When an alarm occurs, in addition to the red LED and the
warning triangle in the display, this can also be identified via
the alarm output on pin 7. See chapter Alarm Configuration.
There are two options.
NOTICE! Pin 7 is not a switch in the sense of an NO con-
tact. Depending on the alarm status, pin 7 is connected to
earth (L-) or not connected (floating).
Start
Time / s
BX150102 ◦ 03/2021