Flush mount pressure transmitters

Model 550 Pressure Transmitter

Model 550 Pressure Transmitter

550 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.


Full Scale Pressure Range (FSPR)
0-50, 100, 150, 200, 250, 300, 500, 750, 1000, PSIG, PSIS, PSiA
Combined Accuracy (Non-Linearity, Hysteresis, Repeatability)

Full Scale Output (FSO)

16 mA at ±0.5% FSO
  Long Term Stability: ≤±0.5% FSO
Pressure Connection Effect Zero Balance ≤±0.5% FSO
Mechanical & Eletrical 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


Sensor Technology
Bonded foil strain gage
Supply Voltage
12 to 40 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 ±1% FSO
Zero Adjustment Not applicable
Span Adjustment Not applicable
Range Calibration Signal Not applicable
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


Enclosure Materials
304 and 316 stainless steel
Wetted Materials
17-4PH NACE (Inconel X750 optional)
Laser etched onto bod
Measured Fluids Any gas or liquid compatible with 17-4PH NACE
Enclosure Classification .NEMA 4X, 5, 6, 12


Pressure Connection

M44 X 1.25 fitting

Proof Pressure
1.5 times rated range
Burst Pressure Sensor

≥ 3 times rated range or max range of clamp and tubing, whichever is less

Weight 16 oz


Alernate Connectors
BZ Micro change connector
ZP 6-pin hermetic (Bendix style)
Performance Options
DG Improved temperature compensation
DH Special range (550 only)
EA Special calibration
JJ Direct mount indicator with Explosion Proof housing
JS Direct mount indicator
NH Customer specified identification
PW 1/8 DIN digital indicator
QB Inconel wetted parts
TW Russia Intrinsic Safety