Troubleshooting
63
6.6 Troubleshooting Transmitter
To troubleshoot the transmitter, use one of the following
tests, depending on the device used with your calibration.
Some of the following tests require the use of high quality
fixed capacitors in the picofarad ranges or a Drexelbrook
calibrator box (C-box 401-6-81). Contact the Drexelbrook
Service department if you need a C-box. Fixed
temperature stable capacitors (NPO types) can often be
found at many electronic supply houses.
TRANSMITTER TEST - Using a PC or 275 Handheld
with device Description
1. Determine the span range currently selected on the
electronic unit.
See
Figure 3-9
2. Using the MAX pF values listed in
Figure 6-3
,
select a capacitance value near the midpoint of
the MAX pF range. For example, position #4 has
a MAX pF range of 2000 pF. Select a 1000 pF
capacitance for this test.
3. Remove all three connections of the coaxial cable at
the transmitter's probe terminals.
4. Place capacitor on transmitter from
PROBE
to
GND
(ground) terminals See
Figure 6-1
.
5a. Using a
PC
- Using the real-time view (F4), verify
that the displayed capacitance value is within the
value and tolerance printed on the test capacitor.
If using a Drexelbrook C-box, be sure to add the
standing capacitance of the box (10pF low range,
20 pF normal range).
5b. Using a
Rosemount 275 handheld
with device
description - Viewing the
HOME
screen, verify
that the displayed capacitance value is within the
value and tolerance printed on the test capacitor.
If using a Drexelbrook C-box, be sure to add the
standing capacitance of the box (10pF low range,
20pF normal range).
6. If the displayed capacitance value is within the
stated tolerance, the unit is working. If the
displayed capacitance value is not accurate, call
1-800-527-6297.
GROUND
PROBE
PAD
SHD
RANGE SPAN
SPARE
1 2 3 4 5 6
CAP
Always Install to Local
Codes / Requirements /
Directives as Mandated
by the Authority Having
Jurisdiction
Install Per
420-0004-203-ID
WARNING:
Substitution of
Components May Impair
Intrinsic Safety.
WARNING:
To Prevent Ignition
of Flammable
or Combustible
Atmospheres, disconnect
Power Before Servicing.
Figure 6-1
Содержание RCT 10 series
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