Differential pressure transmitters

Model 374 Differential Pressure Transmitter

Model 374 Differential Pressure Transmitter

The Model 374 differential pressure transmitter measures pressure ranges from 5" W.C. to 100 PSID and provides a 4-20 mA output signal. All wetted surfaces, including flanges and diaphragms, are constructed of 316 stainless steel with a sealing Viton® O-Ring for excellent corrosion resistance. A standard 1,000 PSI static line pressure and single side overpressure rating are featured with these transmitters. For applications that require a higher static line pressure rating, 3,000 PSI is available with optional flanges.
Viatran Model 374 also features an internal calibration circuit for easy field set-up, a quick disconnect electrical connection and external zero and span controls. A special option called fast response enables the unit to accurately respond to changes in pressure in approximately one tenth of the standard time.These features make the Model 374 ideal for most industrial test and flow applications.


  Full Scale Pressure Ranges 0-5, 10, 20, 50, 100, 300, 750" W.C.D.
0-15, 50, 100 PSI
Nonlinearity (Best Fit Straight Line) ≤±0.15% FSO
Hysteresis ≤±0.15% FSO
  Repeatability ≤±0.08% FSO
Full Scale Output (FSO) 16 mA
Resolution Infinite
Long Term Stability ≤±0.1% FSO per 6 months
Zero Shift with Base Pressure 5” WC to 100” WC : ≤ 4%
300” WC to 100 PSI: ≤ 6
Span Shift with Base Pressure 5” WC to 100” WC : 0 to -6%
300” WC to 100 PSI : 0 to -4
Zero Shift After 1000 PSI Overload Single Side: ≤± 0.1% FSO
Alternate Sides: ≤±0.5% FS
  Compensated Temperature Range 70°F to 170°F (21°C to 76°C)
  Operating Temperature Range 0° F to +200° F
  Storage Temperature Limits -40°F to +250°F (-40°C to 121°C)
  Temperature Effect on Zero ≤± 2.0% FSO per 100° F
  Temperature Effect on Span ≤± 2.0% FSO per 100° F


Supply Voltage:
10 to 42 Vdc
Power Supply Regulation
≤±0.0001% FSO per Volt change over the supply voltage range
Output Signal
4 to 20 mA
  Load Impedance 0 Ohms at 10 VDC 1600 Ohms maximum at 42 VDC
Zero Adjustment ±5% FSO min./ ±50% FSO max.
Span Adjustment ± 10% FSO min. / ±50% FSO max.
Calibration Signal 80% of the FSPR, by shorting pins E & F
Calibration Signal Accuracy ≤±0.1% of the stated value

Circuit Protection

Varistor protected across the input leads for surges above 40V and currents to 250 Amps peak with a pulse width of 8 x 20 µSec. Reverse polarity protected
Insulation Resistance Reverse polarity protected
  Response Time 10% to 90% FS Faster response available with NF option
Electrical Connection Bendix PT02E-10-6P, mates PT06E-10-6S (SR)

Wire Codes

Pin A + Signal
Pin B - Signal
Pin C Calibrate
Pin D Calibrate
Pin E No connection
Pin F No connectio


Wetted Materials
316 Stainless steel and Viton O-Ring
304 and 316 Stainless Steel with an Aluminum alloy, black zinc-cobalt plated electrical connector
  Weight 3.5 lbs. (6.5 lbs. with optional flanges)
Laser etched onto body


Pressure Connection:
1/4" - 18 NPT female
Static Pressure 1000 PSI maximum (3000 PSI - optional)
Proof Pressure
1000 PSI single sided (3000 PSI - optional)
Burst Pressure 1500 PSI (4500 PSI - Optional)
Diaphragm Displacement Standard Flanges: 0.4 cubic inches
Optional Process Flanges : 1.5 cubic inches
Diaphragm Displacement 0.002 cubic inches at FSPR
  Fill Fluid Dow DC200 Silicone oil
  Mounting May be supported by process piping or by optional mounting bracket


B ( )
Alternate electrical connector
DG Improved temperature compensation to ±1.0% FSO per 100°F
Special ranging
DK Special shunt calibration setting
DM Modified full scale output
DQ Cleaning for oxygen service
  EA Special calibration run
  GE Buna 'N' O-Rings
NB Alternate process flanges for increased pressure rating
NF Fast response time
NH Customer specified identification
NM Alternate output signal (3mV/V)

Y ( )

Alternate pressure ports
Note pplication of some available options may affect standard performance. Consult your Viatran representative for details.