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.
PERFORMANCE
| Full Scale Pressure Ranges | 0-5, 10, 20, 50, 100, 300, 750" W.C.D. 0-15, 50, 100 PSI |
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| 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 |
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| Span Shift with Base Pressure | 5” WC to 100” WC : 0 to -6% 300” WC to 100 PSI : 0 to -4 |
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| Zero Shift After 1000 PSI Overload | Single Side: ≤± 0.1% FSO Alternate Sides: ≤±0.5% FS |
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| 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 |
ELECTRICAL
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Supply Voltage:
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10 to 42 Vdc
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Power Supply Regulation
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≤±0.0001% FSO per Volt change over the supply voltage range
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Output Signal
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4 to 20 mA
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| 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 | |
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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) | |
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Wire Codes |
Pin A + Signal Pin B - Signal Pin C Calibrate Pin D Calibrate Pin E No connection Pin F No connectio |
MATERIALS OF CONSTRUCTION
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Wetted Materials
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316 Stainless steel and Viton O-Ring
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Housing
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304 and 316 Stainless Steel with an Aluminum alloy, black zinc-cobalt plated electrical connector
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| Weight | 3.5 lbs. (6.5 lbs. with optional flanges) | |
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Identification
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Laser etched onto body
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MECHANICAL
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Pressure Connection:
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1/4" - 18 NPT female
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| Static Pressure | 1000 PSI maximum (3000 PSI - optional) | |
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Proof Pressure
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1000 PSI single sided (3000 PSI - optional)
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| Burst Pressure | 1500 PSI (4500 PSI - Optional) | |
| Diaphragm Displacement | Standard Flanges: 0.4 cubic inches Optional Process Flanges : 1.5 cubic inches |
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| 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 |
OPTIONS
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B ( )
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Alternate electrical connector
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| DG | Improved temperature compensation to ±1.0% FSO per 100°F | |
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DH
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Special ranging
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| 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) | |
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Y ( ) |
Alternate pressure ports | |
| Note | pplication of some available options may affect standard performance. Consult your Viatran representative for details. |
DIMENSION
