High pressure transmitters

Model 349 Pressure Transmitter

Model 349 Pressure Transmitter

The Model 349'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 durability where diaphragm type sensors can rupture.Model 349 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.


  Full Scale Pressure Ranges 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) 16 mA
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)


Supply Voltage
9 to 40 Vdc
Power Supply Regulation Effect
≤±0.01% FSO per Volt
Output Signal
4 to 20 mA
Load Impedance 1500 Ohms max at 40 Vdc max
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 +Signal
PIN B -Signal
PIN C Calibrate
PIN D Calibrate
PIN E No Connection
PIN F No Connectio


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 Factory
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


Wetted Parts
5 thru 150 PSI      -  316, 304 SST
200 thru 15K PSI  - 15-5 PH SST
20K - 100K PSI    - Stainless Steel
316L SST
15 oz, nominal
Identification Laser etched onto body