1.
Connect the calibrator to input terminals, ensure polarity is
correct.Connect as above with mA meter in place of, or in series
with load Turn on and wait a few minutes before calibration, to
allow the transmitter to stabilise.
Let Va= input voltage for 4mA output
Vb= input voltage for 20mA output
2.
Set calibrator to simulate Va, first rotate coarse offset to obtain a
output reading close to 4mA. Use fine adjuster to trim reading to
4mA
±
0.005mA. (if the trim hits end of travel re-adjust coarse
adjuster one step , re-adjust fine offset).
3.
Set calibrator to simulate Vb, first rotate coarse span to obtain a
output reading close to 20mA. Use fine adjuster to trim reading to
20mA
±
0.005mA. (if the trim hits end of travel re-adjust coarse
adjuster one step , re-adjust fine offset. Note clockwise rotation of
the coarse adjuster reduces output current)
4.
Set calibrator to Va, adjust fine offset for 4.00mA
±
0.005mA
5.
Set calibrator to Vb, adjust fine span for 20.00mA
±
0.005mA
6.
Repeat steps 4 and 5 until both points are in calibration.
7.
Turn off power and remove wires. Mark isolator with the new
range
5.0 MECHANICALS DETAILS
DISEÑOS Y TECNOLOGÍA
Travessera de Les Corts, 180
08028 BARCELONA, Spain
Tel: +34 - 93 339 47 58
Fax: +34 - 93 490 31 45
e-mail: [email protected]
DITEL FRANCE, s.a.r.l.
Les Costes,D18
30360 CRUVIERS-LASCOURS,France
Tel: +33 -(0)4 66 542 770
Fax: + 33 -(0)4 66 542 771
e-mail: [email protected]
DITEL CORP.
379 Rye Beach Avenue
Rye, NY 10580, USA
Tel: +1 914-967 2957
Fax: +1 914-967 0658
e-mail: [email protected]
2.2 ENTRADA
4.0 RANGES
The isolator is normally suplied factory ranged but if required the range
can be changed by means of the range selection switch plus a sixteen
step coarse, and multi turn fine, offset and span adjusters, accessible
from the side of the housing.
The following equipment is required;
•
Precision mV/V calibrator to simulate input
•
DC miliamp meter(digital); accuracy 0.05% on 0 to 20mA range
•
Power Supply, 24V DC 30mA max.
•
Trim tools
Decide on the range required and ensure the transmitter is capable of the
range. If a range has not been specified at time of order, the transmitter
will leave the factory set as 0-1V. Refer to the table below and set the
range selection switch to the correct position.
Switch
Span
Offset
0
20 to 200mV
-20 to 80mV
1
0.2 to 1.0V
-0.1 to 0.4V
2
1.0 to 5.0V
-0.5 to 2.0V
4
5.0 to 25V
-2.5 to 10V
8
25 to 48V
-5 to 25V
F
20 to 100V
-10 to 40V
