Ashcroft ZT11-C3 Handleiding voor installatie- en onderhoudsinstructies - Pagina 6
Blader online of download pdf Handleiding voor installatie- en onderhoudsinstructies voor {categorie_naam} Ashcroft ZT11-C3. Ashcroft ZT11-C3 8 pagina's. Non-sparking high purity transmitter
Pagina afdrukkenInstallation and Maintenance Instructions for
ZX11 Non-Sparking High Purity Transmitter
Be sure to recalibrate the device using a set method or reca-
libration standards. Take special care not to effect the explo-
sion-proof performance of the instrument when inspecting in a
hazardous area.
The following is a routine inspection checklist
for your reference and use
Routine Inspection Checklist
• Physical Appearance (scratches, cracks, warping,
corrosion, etc.)
• Corrosion status of pressure inlet
• Clogging of the air inlet
• Leak test for the connection points and re-tightening of con-
necting screw
•
Check and tighten all instrument screws
•
Insulation resistance between each terminal and case
(at 100MΩor more/50V DC or less)
• Output check by a pressure reference device and measuring
instrument
• Avoid electrostatic discharge.
• Use a soft cloth moistened with water to
m
only clean the external parts of the instru-
CAUTION:
ment. Do not use thinner, benzene, etc.
which cause deterioration and failure.
9.2 Adjustment
Remove the rubber plug (tethered plug) mounted to top of the
enclosure.
• The rubber plug is equipped with a simple
tethering function, however if it is pulled
m
strongly, the function is impaired. Please be
CAUTION:
careful not to pull too much more than nec-
essary [<17 in. lb.].
The "Z" on the rubber plug indicates the position of the
potentiometer for Zero adjustment, and the "S" indicates
the position of the potentiometer for Span adjustment.
• Do not attempt adjustments if product is
wet. Do not allow water to enter the product
as this can lead to damage and/or
accidents.
• Make adjustments once the product has
been powered and allowed to warm up for
m
CAUTION:
15 minutes (recommended 30 minutes).
© Ashcroft Inc. 2020, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0357, www.ashcroft.com
All sales subject to standard terms and conditions of sale. ZX11_Transducer_im_RevA_(I&M011-10278)_06-05-20
• Zero and span adjustment are performed
by rotating zero/span potentiometer with
resin or ceramic Phillips screwdriver. Be
careful not to mistake the position and ori-
m
CAUTION:
entation of each adjustment.
• Avoid placing an excessive load [within 5N,
10 sec.] on the zero/span adjustment poten-
tiometer as this can lead to damage.
• Be extremely careful not to cause a short
circuit with the screwdriver.
• Use properly calibrated and traceable
instrumentation to verify adjustments.
(1) Zero adjustment
Zero adjustment is performed by rotating zero/span adjust-
ment potentiometer shown in the figure (Page 9) with Phillips
screwdriver.
Note: Refer to the following directions as the adjustment meth-
od for positive and compound ranged products differ.
[Positive pressure range]
Be sure that the applied pressure to the sensor has been
returned to atmospheric pressure (no pressure) state; adjust
the sensor output at this time to 4mA DC.
[Compound range]
Be sure that the applied pressure to the sensor has been
released to atmospheric pressure (no pressure) state; adjust
the sensor output at this time to the value calculated by the
following:
• Output 4 to 20mA DC (current output)
[Output mA DC in atmospheric pressure state] = [16mA DC]
/ ([Upper limit output in range (MPa)] - [-0.1 MPa]) x 0.1 +
[4mA DC]
e.g.) <0.5MPa, Compound range: 6.67mA DC> /
<1.0MPa, Compound range: 5.45mA DC>
• Do not rotate span adjustment potentiometer
m
CAUTION:
during zero adjustment.
• Avoid putting an excessive load, >44 in. lb.,
10 sec., on the zero/span adjustment poten-
tiometers as this may result in damage.
(2) Span adjustment
When attempting span adjustment with a pressure reference
device, please follow the instructions listed below.
Zero/span adjustment is performed by rotating zero/span
adjustment potentiometer with a slotted screwdriver as shown
in the following figure.
6