KROHNE H250 M8-M9-M10 EN - Manual (Page 53)

OPERATION
6
53
H250
www.krohne.com 04/2011 - 4000269302 MA H250-R02 en
3.5 CONTACT B2 NC contact See CONTACT B1
NO CONTACT See CONTACT B1
3.6 PULSE
DURATION
30 ms
50 ms
100ms
200 ms
500 ms
3.7 PULSE/UNIT 0.000001 Smallest scaling factor
Note:
In the basic setting, the unit of the pulse output corresponds to the flow
unit.
Example: volume flow unit is m
3 /h, so the pulse output is set to pulses /
m 3 or
mass flow unit is kg/h, so the pulse output is set to pulses / kg
999999.0 Largest scaling factor
3.8 FUNCTION B3 INACTIVE
ACTIVE HI The internal counter is reset to zero when a positive voltage of from
5...30 VDC is applied to terminals R+ and R for at least 100 ms.
ACTIVE LO The internal counter is reset to zero when a positive voltage of from 5...30
VDC applied to terminals R+ and R is interrupted for at least 100ms..
3.9 MULTIDROP 0…15 Multidrop mode means that the device works continuously in bus mode
via HART
® communication (max. 15 devices in parallel).
The analogue current output is then set to a fixed value of 4.1 mA.
Measured values are transferred via HART
® communication.
However, the display allows local read-off of the measured values.
The polling address can be set to 1...15.
Larger integer values are not permitted. If the polling address is set to 0,
then HART
® bus mode is switched off.
The device is working in analogue mode. Current output 4...20 mA is
active.
Standard HART
® communication remains guaranteed.
3.10 4mA CALIBR. This menu item allows precise calibration of the current output.
The device generates a fixed current output of 4.00 mA.
If the measured value deviates from the displayed one, then the
measured value must be input.
When the menu is exited, the corrected value is saved.
3.11 20mA CALIBR. This menu item allows precise calibration of the current output.
The device generates a fixed current output of 20.00 mA.
If the measured value deviates from the displayed one, then the
measured value must be input.
When the menu is exited, the corrected value is saved.
3.12 ALARM
CURRENT
OFF Measured values > 100% are indicated as a current signal up to a
maximum of 22 mA.
ON In the event of an error the current output is set to the fixed value of
22m A.
3.13 END & UNIT The flow unit and the upper range value can be changed.
Note:
Changing from volume flow measurement to mass flow measurement is
only possible with a new calibration.
3.13.1 FLOW RATE For a units list, see chapter 7.4 of the handbook
3.13.2 COUNTER As standard, the unit for the counter is derived from the unit for the flow
measurement.
It can also be changed individually.
Level Designation Selection /
Input Explanation
MA_H250_R02_en_269302_PRT.book Page 53 Tuesday, April 12, 2011 10:17 AM