Kobold NRM, Operating Manual

Page: 12 / 52

NRM
page 12 NRM K06/0422
U
minimal supply voltage (4 mA)
= 4 mA x load resi U
input minimum (4 mA)
U
minimal supply voltage (4 mA)
= 4 mA x 250 Ohm + 19 V = 1 V + 19 V = 20 V
Therefore in case of 250 Ohm load resistance 20 V power supply voltage is just
enough for the total 4-20 mA measuring range.
7.3 Loop current checking with hand instrument
After removing the cover and the Display Module, the actual loop current can be
measured throughout an internal 1 Ohm shunt resistor by connecting
a voltmeter (in the range of 200 mV) to the points 2 and 5 indicated on the wiring
drawing above (see 7.1)
8. Programming
The NRM transmitters can be programmed (basically) with the following two ways:

Programming with the NRM-300P display unit (see 8.2)
All features of the unit can be accessed and all parameters can be set, such as
measurement configuration and optimisation, outputs, dimensions for 11 tanks with
different shape, 99-point linearization.

Programming with NUS-NTB-NRM-SW configuration software (using
HART
® modem e.g. HARTCOMM)
The
NRM-4...1x and NRM-4...Hx types include the NRM-300P display unit.
The NRM transmitters are fully operational without the NRM-300P display as well;
it is only needed for local programming and / or local measurement displaying.
FACTORY DEFAULT SETTING
The NRM series level transmitters are factory programmed by the following way:

Measurement mode: Level (LEV). The displayed value is the measured
level.

The current output and the bargraph on the right are proportional to the
measured level.

4 mA and 0% are assigned to zero level.

20 mA and 100% are assigned to the maximal level.

Error indication by the current output: holding the last value.

Level tracking time constant: 15 sec.