INSTALLATION DATA MANUAL
MODEL 570/770/870 PRESSURE TRANSMITTERS
MODEL LP770 PRESSURE TRANSMITTER
3829 Forest Parkway, Suite 500
Wheatfield, NY 14120
Int’l: 1-716-629-3800
Toll Free: 1-800-688-0030
Fax: 1-716-693-9162
www.viatran.com
solutions@viatran.com
98MANALX70 Rev. A 10/19/10
COMPANY BACKGROUND
Viatran is an ISO 9001:2008 certified company committed to providing high quality pressure transducers
and transmitters. Established more than 40 years ago, Viatran has built its reputation on providing
durable, and accurate pressure sensing devices. Our products are often specifically specified by
integrators and engineering firms for applications ranging from the offshore oil rigs to tank and well level
measurement. Viatran is often called for custom modifications for applications where standard products
are not available.
TECHNICAL SUPPORT
Technical assistance is available Monday – Friday 8:00 AM to 5:00 PM (Eastern) from our knowledgeable
factory personnel to answer any of your application or installation questions. Our toll free number is
1-800-688-0030. Questions or additional documentation can also be requested via e-mail at solutions
@viatran.com.
CUSTOMER SERVICE
Orders for additional units or accessories can be placed by calling customer service at 1-800-688-0030 or
by fax at 1-716-693-9162. Orders can also be placed by contacting a local representative in your area.
To find the nearest representative, visit our web site at www.viatran.com.
PRODUCT OVERVIEW
All information contained in this document is representative of a standard Model 570/770/870 and LP770.
If the product you ordered has special requirements or modifications, refer to the permanently marked
information on the product and you purchase order for possible alteration to the product’s configuration.
Failure to verify product configuration before installation may cause permanent product damage and in
most cases, void the manufacturer’s product warranty. If you are unsure or have questions about you
product, please contact our Application Engineers for assistance.
Remove and retain all instruction manuals and performance certificates that are shipped with the product.
These documents provide important information on the product’s calibration, operation, safety
precautions, recommended maintenance, re-calibration requirements, repair service instructions and
warranty information. These documents are updated from time to time as changes to the product occur
and should be reviewed at receipt so that proper and safe installation can occur.
BASIC OPERATION
The “70” Series has been pre-set at the factory for the required output. Typical outputs are 4-20 mA, 0-5
VDC (1-5 VDC on LP770) and 2 mV/Volt. With the exception of absolute units which are referenced to
absolute zero (full vacuum), all other products are referenced to atmospheric pressure (zero PSIG). Once
factory set, the product should perform as indicated by the performance certificate and product labeling.
In all cases the zero and span cannot be externally adjusted, hence any deviation from the factory
settings would indicate damage to the sensor, electronics, or both.
A. For compound ranges with a voltage output, (a negative pressure to a positive pressure, ie. -15 to
+50), the zero balance will occur and be set for zero PSIG. For the compound range the output of the
transmitter will be split between the plus and minus pressure ranges with respect to zero. The output
would be plus or minus depending on the type of pressure applied to the pressure port. For
compound ranges with a 4-20 mA output, where an output is required at a negative pressure (ie. -15
to +50) the zero balance will be set at the negative pressure (ie. 4 mA at -15 and 20 mA at +50 PSI).
B. Output for sealed units will go positive with positive pressure applied to the pressure port.
C. For absolutes, the pressure port must have a full vacuum applied to reach the absolute zero point.
After the full vacuum is applied, the unit will begin to read positive pressure changes as less and less
of a vacuum is evident at the pressure port.
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INSTALLATION REQUIREMENTS AND CAUTIONS
1. All electrical & pressure connections should be compatible with specifications outlined above.
2. Installation should occur only after electrical (input power) and line pressure is off and at zero.
3. The product’s internal electrical circuitry is isolated from case ground. It is not recommended that the case or
ground of the unit be connected to the input, output, or calibrate pins of the product or wiring system. Ground
loops and line noise will affect the product’s performance and may cause internal electrical failure.
4. All products should be protected from direct or continued exposure to fluids at the electrical connection. The
electrical connections on the Models 570, 770, 870, and LP770 have been designed to be terminated in a
junction box or encased in conduit. In applications where moisture or fluid contamination is possible, the use of
an application approved connection box is recommended for connection termination.
5. Use care when handling the unit by the connection wires. Continued or constant movement of the connection
wires at the area of sealant might cause the seal to break. If the seal fails, internal contamination and product
failure will occur.
6. When installing the unit to a pressure or electrical connection, only use the wrench flats closest to the end being
installed. If the unit is being installed on a pressure pipe, only use the 1-1/4” wrench flats at the end where the
pressure port is located, not the 1-1/8” flats at the electrical end.
7. At no time should an object be inserted into the pressure port or pressed against the sensing area to deflect the
sensor (to test or simulate pressure), as permanent damage to the sensing diaphragm may occur.
8. To preserve the integrity of the hermetic design, the units have no field replaceable or repairable parts.
9. When shipped in quantities, units should be packaged individually to eliminate possible damage.
10. The “70” Series can be provided with a variety of pressure fittings. The units should be mounted using an anti-
galling product on the threads that is compatible with the media being measured. If your unit is equipped with a
NPT female pressure port, it should be mounted to 20 ft-lbs. of torque to ensure proper trim. Always check for
process leaks after installation.
MAINTENANCE AND REPAIR
Viatran transmitters are 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 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. Whenever the
product is removed from service, the connector and pressure port threads should be cleaned and the pressure cavity
flushed with a stainless steel compatible cleaner to prevent media buildup. A lint-free cloth is recommended for
cleaning. Cleaning with a coarse or stiff bristle can damage the diaphragm surface.
It is suggested that the calibration be verified on a usage dependent schedule. It the product is in continuous service
7 days a week, 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 may 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.
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