Model 349 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.


 High Accuracy
 Many Options available
 All Stainless Steel construction


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.


Data sheet  249-349

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
≤0.06% FSO
≤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 Connection