Viatran 574 Manuale di installazione e d'uso
1
98MANAL574 Rev. F
INSTALLATION DATA MANUAL
MODEL 574
PRESSURE TRANSMITTER
199 Fire Tower Drive
Tonawanda, NY 14150
Int’l: 1-716-629-3800
Toll Free: 1-800-688-0030
Fax: 1-716-693-9162
www.viatran.com
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98MANAL574 Rev. F
PRODUCT OVERVIEW
All information contained in this document is representative of a standard Model 574. 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.
INSTALLATION DATA - VIATRAN MODEL 574
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.
CONNECTION DIAGRAMS
Recommended Mounting
250O
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98MANAL574 Rev. F
INSTALLATION REQUIREMENTS AND CAUTIONS
1. All electrical and pressure connections should be compatible with the above specifications.
2. The Model 574 is susceptible to sensor damage by being dropped, struck, or installed in a high vibration
environment.
3. Installation should occur only after electrical (input power) and line pressure is verified as being off and at zero.
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 or output of the product or wiring system. Ground loops and line
noise will affect the product’s performance and may cause internal electrical failure.
5. Due to the effects of gravity on oil fill of the sensor, it is recommended that the product be mounted as shown
above. If the product is mounted on its side (pressure port facing up) the effect of gravity will show as drift or
product instability
6. Small amounts of vacuum will not damage the product. If a high vacuum is desired, both pressure ports must be
equally drawn down at the same time.
7. The pressure flanges are removable to facilitate cleaning of the pressure cavities. Care should be taken not to
damage diaphragms when flanges are removed. When reassembled, the bolts should be torqued in a criss-
cross pattern; for process flanges with 7/16 x 20 nuts & bolts to 22.0 ft. lbs. or for standard flanges with 5/16 x 24
nuts & bolts to 11.5 ft. lbs.
8. Process media and cleaning solution should be compatible with 316 SS, Viton O-Ring.
9. All products should be protected from direct or continued exposure to fluids at the electrical connection. The
electrical connections on the Model 574 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 a NEMA rated connection
box is recommended for connection termination.
10. 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 fill loss and/or damage to the sensing diaphragm may occur.
11. During installation it is recommended that the unit be mounted to allow fluids or contamination to flow away from
the module screw area, so as not to collect on the screw heads or sockets. (Do not mount the unit facing up.)
12. When shipped in quantities, units should be packaged individually to eliminate possible damage.
13. To preserve the integrity of the hermetic design, the units have no field replaceable or repairable parts.
BASIC OPERATION & INTERNAL CALIBRATION CIRCUIT
(See Maintenance and Repair for calibration frequency recommendations.)
Note: The casting of the module has raised numbers at the adjustment screw positions. Those numbers reflect
the following function of the assigned screw.
Screw 1: Top Left, Coarse Zero Pot (CCW - Lower, CW - Raise)
Screw 2: Top Right, Fine Zero Pot (CCW - Lower, CW - Raise)
Screw 3: Lower Left, Internal Cal. Activation Pot (12 or 6 o’clock position – Disengage; 3 o’clock position - Engage)
Screw 4: Lower Right, Span Adjustment Pot (CCW - Lower, CW - Raise)
1. Outside of using the calibration circuit or the availability of a metrology lab for obtaining a pressure (Full Scale)
reading, no object should be used to physically move the sensor.
2. Once proper connections and power are applied, the unit should begin to function.
3. Check the zero output (4.00 mA) with the performance certificate to verify readings. If it is out of specification
from the performance certificate, use the coarse and fine zero adjustment screws to obtain the proper reading.
4. With no pressure applied, engage the calibration circuit by slowly rotating the calibration screw until the current
output rises to about 8.80 mA’s (standard calibrated range). Check the reading with the performance certificate.
If the reading is off, adjust the span screw to raise or lower the reading – return the calibration circuit to the
original position.
5. When making zero and/or span adjustments, there may be some interaction between the zero and span
readings - repeat adjustments if needed.
6. Always return the calibration screw to off or full CCW position before installing the transmitter into the application.
Note: This is a common reason for incorrect readings at start-up. The calibration circuit must be deactivated in
order for the product to perform properly.
7. Once the product has been tested and functionality verified, the power and meter connections may be removed
and the product reconnected to the instrumentation loop.
NON-STANDARD RANGE (NSR) CALIBRATION
Definition
NSR: A non-standard range is a alternate scaled reading requested by the customer. Through the use of a single
transmitter, numerous pressure ranges can be set-up. The Model 574 can be scaled down to any pressure range to
five times the original range. Only NSR requests for ranges less than the sensor rated range are recommended and
in most cases possible. The NSR is possible due to the ability of the adjustment screws to alter where the zero and
span will fall. Refer to the below example for field NSR calibration.
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98MANAL574 Rev. F
NSR EXAMPLE
You have Viatran’s Model 574 with a standard range of 0 to 300 PSI. You would like to set an NSR of 0 to 150 PSI.
Refer to the Performance Certificate and obtain the following:
Zero = 0 PSI = 4.00 Ma
Full Scale = 300 PSI = 20.00 mA
Cal Value = 90.04 PSI = 8.81 mA
In order to recalibrate the transmitter, you must determine the cal reading in mA’s at the NSR range. This is done by
calculating what the cal output should be at the NSR range. For the example listed, the standard calibration value is
set to represent 90.04 PSI. Once internally set, the calibration (Cal) will always represent this pressure.
Use the formula: Cal mA’s = [(16 x Standard Cal Pressure) / desired range] + 4
Substitute Actual Numbers: Cal mA’s = [(16 x 90.04) / 150] + 4
Cal mA’s = (1440.64 / 150) + 4
Cal mA’s = 9.604 + 4
Cal mA’s = 13.604 mA’s
The zero would be set for 4.00 mA’s, and the calibration circuit will read (after adjusting span) 13.604 mA’s when
activated. This would provide a new NSR range for the unit of 4-20 mA’s over 0-150 PSI.
ACCESSORIES - OPTIONAL EQUIPMENT
Polypropylene Conduit Connection Box - NEMA 4X (4 Connection, Dual Terminal Block) .................. 10000PT-25
Polypropylene Conduit Connection Box (10000PT-25) with 8 Ft. Cable ............................................... 003667.003
Mounting Bracket (Process Flanges – 2” Pipe Mount) ..........................……………………………......... 003791.003
Replacement Process Flanges ........................................................................…………………….......... 010454.003
Digital Indicator (Panel Mount) .....................……………………………….....……............................. Consult Factory
Direct Mount Indicator ......................………………………………….....................…......................... Consult Factory
PREVENTATIVE MAINTENANCE
Note: This checklist should be followed each time a transmitter requires preventative maintenance. Depending on
product usage cycle, all maintenance should be done on a schedule that is reflective of the application.
1. The sensor surface should be visually checked whenever the unit is removed or every 6 months (usage
dependent). Any visible damage, especially deep gouges or cuts in the sensor, would require the unit to be
returned to Viatran for evaluation.
2. Care should be used when handling the unit by the connection wires. Continued movement of these wires will
weaken the seal. Seal failure will result in internal contamination and non-warranty product failure. Visually
inspect the connection area every 6 months (usage dependent).
3. The module door should always remain closed over the adjustment screws. Constant exposure of the adjustment
screws to mists, dusts or contaminants could cause them to become “frozen” in place, causing the module to
become locked and non-usable. This would render external adjustment difficult at best. Replacement magnets
are available if this problem occurs. Hence a visual inspection of the calibration pots should take place on a 2 to
4 week schedule, or when extreme environmental conditions require it.
4. NEVER - Strike a presumed failed transmitter. If the transmitter is in working order, the shock could cause
additional failure.
NEVER - Remove a transmitter from an instrumentation loop with the power on. Protection circuitry designed to
absorb small power surges could become shorted and cause transmitter failure due to “arking”.
NEVER - Ground a transmitter to AC Return (Black). Instant “fatal” failure occurs.
NEVER - Apply input power to the case ground (Green wire). Reduced life span of protection components will
occur.
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 316 stainless steel compatible cleaner to prevent media buildup.
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
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98MANAL574 Rev. F
CLASS I,
574_ME_
PROOF FOR
CLASS II; GROUPS
GROUPS A,B,C,D;
R
CERTIFIED EXPLOSION
Dual Seal
Type 4 Encl.
HAZARDOUS LOCATIONS
E,F,G; CLASS III
FOR USE IN CLASS
574_MD_
ENTITY & SUITABLE
INDOOR & OUTDOOR NEMA 4X
I, II & III DIV. 1, GRPS A-G,
INTRINSICALLY SAFE,
CD0602
HAZARDOUS LOCATIONS PER
APPROVED
574_FA_
OC.C.30C001.A No 73774
METROLOGY CERT:
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.
OPTIONAL CERTIFICATIONS
SPECIAL CONDITIONS FOR USE
Certificate Type Special Instruction
1000784 (LR 34272) CSA Explosion Proof
Transmitter must be powered by an approved SELV
source, in accordance with CSA standard C22.2
No.1010.1, Annex H
199 Fire Tower Drive
Tonawanda, NY 14150
Int’l: 1-716-629-3800
Toll Free: 1-800-688-0030
Fax: 1-716-693-9162
www.viatran.com
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