Viatran 118 Installation and user guide

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98MANALX18 Rev. B9/4/14
INSTALLATION DATA MANUAL
MODEL 118/218/318
PRESSURE TRANSMITTER
3829 Forest Parkway, Suite 500
Wheatfield, NY 14120
Int’l: 1-716-629-3800
Toll Free: 1-800-688-0030
Fax: [phone]
www.viatran.com
[e-mail]

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98MANALX18 Rev. B9/4/14

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98MANALX18 Rev. B9/4/14
SHUNT CALIBRATION
The Model 118 is equipped with an external shunt calibration. This feature allows field calibration to be performed by
electrically simulating pressure. When the shunt calibration is activated, the transducer bridge is unbalanced by an amount
equivalent to the application of approximately 80% of full scale pressure. The exact pressure and output values are listed
on the Performance Certificate.
External shunt calibration is achieved by placing the specified resistor across Pins 2 and 4 of the electrical connector. The
value of the resistor is listed on the Performance Certificate. Internal shunt calibration is optional on the Model 118. Units
with internal shunt calibration have a 6 pin connector. The shunt calibration resistor is built into the transducer and the
circuit is activated by connecting (shorting) Pins 5 and 6 of the connector.
After calibration, the shunt calibration circuit should be deactivated for normal operation.
FIELD CALIBRATION
The Model 218 Series Transducers are provided with a unique feature that permits field calibration to be performed without
the need of a pressure source, by electronically simulating pressure. The nylon access screws should be removed and the
pressure port shall be vented to zero pressure. For transducers measuring absolute pressure, a full vacuum must be
applied to the pressure port. Connecting (shorting) the calibration terminals (Pins 5 and 6), produces an output equivalent to
approximately 80% of full-scale pressure. Refer to the performance certificate, which was supplied with the transducer, for
the exact calibration output. If the certificate is unavailable, the calibration output can be calculated by using the following
formula: Volts DC = (Cal pressure from transducer label / pressure range) x 5. Thus, following adjustment of zero output for
zero pressure, the calibration circuit may be activated and the gain or span adjustment screw can be turned until the correct
calibration output appears at the output terminals. The calibration terminals should then be disconnected and the zero
adjustment reconfirmed. Note - the calibration circuit shall be deactivated during normal operation. The nylon cover screws,
removed to access zero and span adjustments, shall be reinstalled after calibrating the transducer.

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98MANALX18 Rev. B9/4/14
SHUNT CALIBRATION
The Model 318 provides a unique internal shunt calibration resistor that allows field calibration to be performed by
electrically simulating pressure. The connector shall be connected as shown in Fig. 5. The nylon access screws
should be removed and the pressure port shall be vented to zero pressure. For transducers measuring absolute
pressure, a full vacuum must be applied to the pressure port. Connecting (shorting) the calibration terminals (Pins 3
and 4) unbalances the transducer bridge by an amount equivalent to the application of approximately 100% of full-
scale pressure. See the performance certificate, which was supplied with the transducer, for the exact milliamp
output and adjust the span control accordingly. If the certificate is unavailable, the milliamp output can be calculated
by using the following formula: mA = ((Cal pressure / pressure range) x 16) + 4. Thus, following adjustment of zero
output for zero pressure, the calibration circuit may be activated and the gain or span adjustment screw can be turned
until the correct calibration output appears at the output terminals. The calibration terminals should then be
disconnected and the zero adjustment reconfirmed. Note - the calibration circuit shall be deactivated during normal
operation. The access screws should be reinstalled after calibrating the transducer.
ACCESSORIES - OPTIONAL EQUIPMENT
Mating Electrical Connector (118, 318) ............……...................…................................. 10MSWK0204
Mating Electrical Connector (218) ......................….......................….............................. 10MSWK0206
Mating Electrical Cable Assembly (118, 318) ...….......................…................................ 230005.001
Mating Electrical Cable Assembly (218) .........…..........................…............................... 230006.001
Mounting Bracket .................................................................................……........…........ 080002.001
Protective Cover .................................................................................…….............…..... 03XL-20RBC
Digital Meter ...................................................................................................…….....…. Consult Factory
MAINTENANCE AND REPAIR
All Viatran transmitters have been designed to function free from routine or scheduled maintenance. Simple cleaning
of the electrical connector, pressure port threads and pressure cavity on an as needed basis will provide many years
of satisfactory performance. Protecting the product from continued exposure to moisture or fluids at the electrical
connection, breather area (model dependent) will eliminate premature internal failure of the product. Generally any
time the product is removed from service the connector and pressure port threads should be cleaned and the
pressure cavity flushed with a 316SS and/or O-Ring (material model dependent) compatible cleaner to prevent media
buildup. During the cleaning process only a soft, lint-free cloth is recommended. Never use a coarse of stiff bristle
brush to clean media from the diaphragm surface.
It is suggested that the calibration be verified on a usage dependent schedule. If the product is in continuous service
7 days a week, then calibration verification may be necessary every 6 to 8 months. If the product is in a lab test
environment a more lenient verification schedule would be appropriate. In all instances the performance of the
product will depend on the individual application or process in which it is installed. More continued usage would
require a shorter period between calibration verification and product maintenance.
If a product is perceived to be exhibiting problems, it can be returned to Viatran for analysis and/or repair. It is
suggested that only Viatran personnel attempt repair of the product. Any damage resulting from customer
disassembly would result in a loss of coverage under the warranty policy. All Viatran products are able to be repaired
at minimal cost if simple cleaning and precautions are taken in the handling and application of the product. Older
products returned for repair are updated to current specifications unless the repair cost would outweigh the cost of a
new replacement model. Products returned for repair should include information on the person to contact for repair
quote approval, the individual to contact if Viatran’s technical staff requires additional information during analysis, and
a brief description of the problem associated with the product’s failure.
WARRANTY
Viatran Corporation warrants that its products shall be free from defective workmanship and/or material for a period of
twelve (12) months from the date of shipment, provided that Viatran’s obligation hereunder shall be limited to
correcting any defective workmanship and/or replacing any defective material f.o.b. factory. No allowance will be
made for any expense incurred for correcting any defective workmanship and/or material without written consent by
Viatran. This warranty is in lieu of all other warranties expressed or implied.
REPAIR INSTRUCTIONS
Viatran’s Transmitters are designed to be easily repaired and recalibrated if necessary. If a failure occurs, the
transmitter should be returned to the factory for inspection and testing. Please contact the Customer Support
Department at 1-800-688-0030, for a return tracking number and/or a repair cost estimate. A nominal inspection fee
is charged on all units returned to the factory which are not subsequently repaired.