4-20 mA, 5″ WC to 100 psi, Hazardous approvals
Viatran’s Model 544 is a low pressure gage transmitter designed for precise measurement in hazardous locations. External adjustments allow for field calibration and ranging to provide measurement flexibility.
Features
High Accuracy
Many Options available
The 544 features a special internal calibration signal that allows users to calibrate the transmitter without an external pressure source.
The 544 provides a 4 to 20 mA output signal measuring pressures from 0 to 5″ WC thru 0-100 PSIG.
External zero, span, and calibration controls are hermetically sealed for protection against harsh environments.
These controls are externally adjustable with Viatran’s unique magnetically coupled drive system.
Model 544 also has a signal conditioner that allows for 5:1 ranging of the transmitter’s standard pressure range (FSPR).
Designed to meet intrinsically safe standards, the 544 provides reliable and safe pressure measurement in harsh process applications.
Full Scale Pressure Ranges:
- 0-5, 10, 20, 50, 100, 300, 750″ W.C.G
- 0-15, 50, 100 PSIG
- 0-15 PSIV
Nonlinearity (Best Fit Straight Line): ≤±0.15% FSO
Hysteresis & Repeatability: ≤±0.10% FSO
Full Scale Output (FSO): 16 mA at 70° F
Long Term Stability: ≤±0.2% FSO per 6 months
Compensated Temperature Range: 70°F to 170°F (21°C to 76°C)
Operating Temperature Range:
- 5″WC to 50″WC (0° F to +170° F)
- 100″WC to 100 PSI (-40° F to +170° F)
Storage Temperature Limits:
- 5″WC to 50″WC (0° F to +170° F)
- 100″WC to 100 PSI (-40° F to +170° F)
Temperature Effect on Zero: <± 1.0% FSO per 100° F
Temperature Effect on Span: <± 1.0% FSO per 100° F
Supply Voltage: 10 to 40 Vdc
Power Supply Regulation: ±0.02% FSO per volt
Output Signal: 4-20 mA at 70° F
Load Impedance: 1500 Ohms maximum at 40 Vdc
Zero Adjustment：
- Elevation: -100% of FSO
- Suppression: +50% of FSO
Span Adjustment: Rangeable down 5:1 from standard range
Calibration Signal: 20% of FSPR, externally switched
Calibration Signal Accuracy: The exact signal to pressure correlation is provided with each unit
Circuit Protection:
- Varistor protected across the input leads for surges above 40V and currents to 250 Amps peak with a pulse width of 8×20 µ Sec.
- Reverse polarity protected
Insulation Resistance: < 5 nS
RFI / EMI Suppression: <1.0% FSO from 0 to 15 MHz at 2V peak to peak direct contact
Electrical Connections: 1/2″ NPT Male, 3 Wires, 18 AWG, 36″
Connection Color Codes:
Red + Power / Signal
Black – Power / Signal
Green Case Ground
Wetted Parts: 316 Stainless steel
Housing: 316 Stainless Steel with a Cadmium plated electrical connector
Weight: 3.5 lbs. nominal
Identification: Laser etched onto body
Pressure Connection: 1/4″ – 18 NPT female
Proof Pressure: 500 PSI
Burst Pressure: 1000 PSI
Shock Limitation: 5 Gs
Fill Fluid: Silicone oil
Enclosure Classification: NEMA 4X
Mounting: May be supported by process piping or by optional mounting bracket
PERFORMANCE OPTIONS:
DK: Special shunt calibration setting
DQ: Cleaning for oxygen service
EA: Special calibration run
GE: Buna-N “O”-Ring
JJ: Direct mount indicator w/ explosion proof housing
JS: Direct mount indicator
MD: FM label
NF: Fast response time
NH: Customer specified identification
PW: 1/8 DIN digital indicator
ALTERNATE PRESSURE PORTS:
YA: MS 33649-04
YH: 1/8 NPT(M)
YI: 1/8 NPT(F)
YK: 1/4 NPT(M)
YN: 3/8 NPT(F)
Note:
Application of some available options may affect standard performance.
Download Data Sheet
