Viatran 28H Installation and user guide

1
98MANALX8X Rev A
MODELS
28H & 38H/28K & 38K / 28M & 38M
(25” to 32” HgA) (85 to 108 kPaA) (850 to 1080 mBarA)
BAROMETRIC PRESSURE TRANSDUCER
INSTALLATION DATA MANUAL
38 Forge Parkway,
Franklin, MA 02038
Toll Free:1-800-688-0030
International: 716-629-3800
Fax: [phone]
www.viatran.com
[e-mail]

2
98MANALX8X Rev A
PRODUCT OVERVIEW
The Viatran Models 28H & 38H / 28K & 38K / 28M & 38M will here out be collectively known as the Models 28x & 38x.
All information contained in this document is representative of a standard Model 28x/38x. If the product you ordered has special
requirements or modifications, refer to the Laser Marked information on the product and your 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 your 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.
GENERAL REQUIREMENTS & CAUTIONS
1. All electrical & pressure connections should be compatible with the model specifications as outlined below.
2. Installation should occur only after electrical (input power) and line pressure is verified as being off and at zero.
3. At no time should an object be inserted into the pressure port to deflect the sensor (to test or simulate pressure) as permanent fill loss
and damage to the sensing diaphragm will likely occur and void the warranty.
4. 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 will in most cases cause internal electrical failure.
5. All products should be protected from direct or continued exposure to fluids at the electrical connection. It is recommended that for
products installed in areas where the potential for contamination at the electrical connection is possible a “boot” or other protective
measure be taken to eliminate possible deterioration of the product’s electrical connection and corrosion that will impede product
performance.
6. Whenever shipped in quantities, units should be packaged individually to eliminate possible damage.
BASIC OPERATION
The Models 28x & 38x have been designed for accurate barometric pressure measurements and are pre-set at the factory for the
specified pressure range and required output. Once factory set, the product should perform as indicated by the performance certificate
and product labeling. In all cases there is no customer access to zero or span adjustments, therefore any deviation from the factory
settings would indicate damage to the sensor, electronics, or both. The Models 28x & 38x senses absolute pressure and converts this
pressure to a proportional Voltage (28x) or MilliAmp (38x) output signal.
INSTALLATION DATA - VIATRAN MODELS 28H & 38H / 28K & 38K / 28M & 38M
Note: The drawing below is for informational purposes only and is not to scale. All dimensions are nominal, in
inches and for reference purposes only.

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98MANALX8X Rev A
Model 28x
Model 38x
Input:
Input:
8* to 30 VDC
8 to 30 VDC
Output:
Output:
0 to 5 VDC
4 to 20 mA
* = 12 VDC Minimum Input for 0-10 VDC Output Option (DM)
Electrical Mating Connector:
Bendix P/N: PT06E-10-6S(SR) or equal
Sensor Construction and Wetted Materials:
Oil Filled - Silicon - 316 SST
Pressure Connection:
28H & 38H: 1/4” NPT Female
28K, 28M, 38K & 38M:
G1/4" Female
CONNECTION DIAGRAMS
Model 28x
Model 38x
For best noise immunity,
Viatran recommends
connecting the shield of the
cable to the housing and
grounding the housing.
Wiring
Wiring
Pin A: +Power
Pin A: +Signal
Pin B: -Power
Pin B: -Signal
Pin C: +Signal
Pin C: No Connection
Pin D: -Signal
Pin D: No Connection
Pin E: No Connection
Pin E: No Connection
Pin F: No Connection
Shell:Ground
Pin F: No Connection
Shell:Ground

4
98MANALX8X Rev A
ACCESSORIES - OPTIONAL EQUIPMENT
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 cleaner compatible to the specified wetted parts to prevent media buildup. During
the cleaning process only a soft, lint-free cloth is recommended. Never use a coarse or 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.
Toll Free:1-800-688-0030
International: 716-629-3800
Fax: [phone]
www.viatran.com
[e-mail]
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Mating Electrical Cable Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230002.002
Mating Cable Assembly (Improved Shielding) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230043.012
Mounting Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 004102.013
Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . ... . . .. . 230425.002
Digital Meter – Voltage Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Consult Factory
Digital Meter - Current Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Consult Factory
38 Forge Parkway,
Franklin, MA 02038