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MODEL 249 PRESSURE TRANSMITTER

  • Model 249 Pressure Transmitter

Durable, dependable, accurate

Viatran’s “49” series is a robust, highly accurate pressure transmitter designed for the severe environments found in aerospace, engine test and fluid power control applications.

Features

 Many Options available

 All Stainless Steel construction

Specifications

The Model 249’s small size allows flexibility in tight spaces, while the welded body, stainless steel connector and sealed adjustments ensure protection against contamination.

The “49” series utilizes three sensor technologies to achieve top performance through all pressure ranges. For ranges 0-5 to 0-150 PSI, a silicon piezoresistive sensor provides extremely accurate readings and high overpressure protection. Bonded foil strain gage sensors are more reliable for pressure ranges 200 to 15,000 PSI where transient spikes could destroy a silicon sensor.

For pressure measurement over 20,000 PSI, Viatran developed the “tube” sensor. Made from high strength stainless steel, this sensor ensures high accuracy and Sealed Top Adjustmentsdurability where diaphragm type sensors can rupture. Model 249 is equipped with electronic linearization, a compensation circuit that corrects for non-linearities in the sensor.

Surface-mount technology (SMT) allows this complex circuitry to be incorporated into a small package and yield a linearity specification of ≤0.1% FSO (optional to 0.05%). Encapsulation of the surface-mount components of the PC board helps to prevent damage from severe vibration with top-mounted and sealed zero and span adjustments. An internal calibration circuit permits easy 2-point calibration without an external pressure source.

Optional performance features of the “49” series include improved accuracy, temperature compensation, special ranging, modified output, and alternate pressure ports.

Performance

Full Scale Pressure Range:  0-5, 15, 25, 50, 100, 200, 300, 500, 1K, 1500, 2K, 3K, 5K, 7.5K,10K, 15K, 20K, 25K, 30K, 40K, 50K, 60K 75K, 100K PSIA, PSIS, PSIG

Linearity (Best Fit Straight Line):

  • ≤±0.10% FSO
  • For 100K PSI (≤±0.25% FSO)

Hysteresis:  ≤0.06% FSO

Repeatability:  ≤0.03% FSO

Full Scale Output (FSO):  5 Vdc

Long Term Stability:  ≤±0.25% FSO per 6 months

Response Time:  ≤4 mSec to reach 90% of FSO

Temperature Effect on Zero:  ≤±1% FSO per 100°F (37°C)

Temperature Effect on Span:  ≤±1% FSO per 100°F (37°C)

Compensated Temperature Range:  70°F to 170°F (21°C to 76°C)

Operating Temperature Range:  -40°F to 185°F (-40°C to 85°C)

Storage Temperature Limit:  -65°F to 250°F (-54°C to 121°C)

Electrical

Supply Voltage:  9 to 40 Vdc

Power Supply Regulation Effect:  ≤±0.01% FSO per Volt

Output Signal:  0 to 5 Vdc

Load Impedance:  125K Ohms min

Bridge Impedance:  5,000 Ohms nominal

Circuit Protection:  Output may be short-circuited indefinitely. Input polarity may be reversed. Over voltage protection to 1000 volts for <1 mSec duration

Electrical Connection:  6-pin hermetic, bayonet-style, 303 SST weld mount connector

Pin Outs:

PIN A            +Power

PIN B             -Power

PIN C           + Signal

PIN D            – Signal

PIN E              Calibrate

PIN F              Calibrate

Mechanical

Pressure Connection:

  • 0-5 thru 0-15K PSI ~ 1/4″ – 18 NPT Female (0-3.3 thru 0-1034 bar)
  • 0-20K thru 0-50K PSI ~ 1/4″ F250-C High Pressure Tube (0-1378 thru 0-3447 bar)
  • 0-60K thru 0-100K PSI ~ 5/16″ F312C High Pressure Tube (0-4136) thru 0-6894 bar)

Proof Pressure:

  • 5 thru 150 PSI ~ 3X range minimum
  • 151 thru 15K PSI ~ 1.5X range
  • 20K – 100K PSI ~ 1.2X range

Burst Pressure:

  • 5 thru 150 PSI ~ Consult our engineer.
  • 151 thru 15K PSI ~ 5X range or 30K PSI, whichever is less

20K – 100K PSI:  1.5X range or 125K PSI, whichever is less

Pressure Cavity Volume:

  • 5 thru 150 PSI ~ 0.25 cu. in.
  • 151 thru 15K PSI ~ 0.32 cu. in.
  • 20K – 100K PSI ~ 0.10 cu. in.
Mounting:  Supported by process piping or optional mounting bracket

Materials Of Construction

Wetted Parts:

  • 5 thru 150 PSI (316, 304 SST)
  • 200 thru 15K PSI (15-5 PH SST)
  • 20K – 100K PSI (Stainless Steel)

Housing:  316L SST

Weight:  15 oz, nominal

Identification:  Laser etched onto body

Option

Alternate Connector:

BZ:  Micro change connector

Alternate Ports:

YA:  MS33649-04

YG:  MS16142-04

YI:  1/8″ NPT(F)

YK:  1/4″ NPT(M)

YM:  1/4″ F250-C High pressure tube

YN:  3/8″ NPT(F)

YS:  5/16″ F-375-C High pressure tube

YR:  1/2″ NPT(F)

YV:  MS33649-08

Performance Options:

DG:  Improve temperature performance

DH:  Special ranging

DK:  Special calibration setting

DM:  Modified output (i.e., 0-10 Vdc)

DN:  Improved accuracy

DQ:  Cleaning for oxygen service

EA:  Special calibration run

NH:  Customer specified identification

PW:  1/8 DIN digital indicator

Approvals:

TW:  GOST-R

Note:

Application of some available options may affect standard performance. 

  • 249 Drawing