MODEL 551 PRESSURE TRANSMITTER

Flush Mount Sensor, 0-50 thru 1000 psi, Solid Machined Diaphragm, Sealed External Adjustments

551 is designed to provide rugged performance while measuring harsh corrosive materials. The sensor is a stainless steel machined diaphragm, with no oil fill. The zero cavity flush sensor provides an easy clean surface with no clogging. Magnetically coupled external adjustments prevent fluid ingress while providing a rangeable, field adjustable solution.

Features

All Stainless Steel construction

Performance

Full Scale Pressure Range (FSPR): 0-50, 100, 150, 200, 250, 300, 500, 750, 1000, PSIG, PSIS, PSiA

Combined Linearity, Hysteresis and Repeatability: ≤±0.45%

Full Scale Output (FSO): 16 mA at ±0.5% FSO

Resolution: Infinite

Long Term Stability: ≤±0.5% FSO

Pressure Connection Effect Zero Balance: ≤±0.5% FSO

Mechanical & Electrical Combined: ≤0.1mSec

Temperature Effect on Zero: ≤± 2% FSO per 100°F (37°C)

Temperature Effect on Span: ≤± 2% FSO per 100°F (37°C)

Compensated Temperature Range: 0°F to 185°F (-17°C to 85°C)

Operating Temperature Range:

-40°F to 250°F (-40°C to 121°C) -Process
-40°F to 185°F (-40°C to 85°C) -Ambient

Storage Temperature: -40°F to 250°F (-40°C to 121°C)

Electrical

Sensor Technology: Bonded foil strain gage

Supply Voltage: 12 to 30 Vdc

Power Supply Regulation: ≤±0.04% FSO per Volt

Output Signal: 4 – 20 mA at 70°F (21°C)

Load Impedance: 1400 Ohms max at 40 Vdc

Ripple: ≤1% FSO

Zero Balance: 4 mA ±0.5% FSO

Zero Adjustment: -50% FSPR (elevation) to 100% FSPR (suppression). Coarse and fine adjustments standard

Span Adjustment: 5:1 turndown, externally

Range Calibration Signal: 20% ±1% of FSPR, externally switched. The exact signal to pressure correlation is provided with each unit.

Circuit Protection: Varistor protected across the input leads for surges above 38 V and currents to 250 Amps peak with a pulse width of 8-20 µSec. Reverse polarity protected

Bridge Resistance: 5000 Ohms nominal

Insulation Resistance: ≥ 2000 MegOhms at 50 Vdc

RFI/EMI Suppression: ≤1% FSO output change at 30 V/meter, 10-1000 Mhz

Electrical Connection: 1/2” NPT male conduit, 3 wires, 18 AWG, 36”L

Wire Color Codes:

Red + Power/Signal

Black – Power/Signal

Green Case Ground