Posted in | Pressure Sensors

Model 511 - Hammer Union Pressure Transmitter

The Viatran Model 511 hammer union pressure transmitter is among the most advanced in this field. It has an output of 4-20 mA, with a 2 inch 1502 fitting. It is approved for use in hazardous locations. It is ideal for such situations because of its unique design features, created to fulfill direct feedback requests from actual operators. Thus it has such advantages as a voltage-powered tool to calibrate the shunt, the ability to detect and track spikes in pressure, using software from HART® Communicators or DevCom2000-Lite. The whole sleek device is housed in an extremely rugged housing which can resist high vibrations and extreme impact amounting to abuse, while still maintaining standard parameters of performance.


The Model 511 Hammer Union Pressure Transducer offers an array of features such as:

  • Compliance with RoHS
  • Suitability for high pressure situations of use
  • The ShuntCal to calibrate the shunt
  • An IP-68 approval
  • A 1502 fitting for the hammer union
  • A housing which offers easy access to the connector and provides 77% more area
  • A higher compensated temperature range of operation
  • A better sealing method to seal connector pins
  • External controls for settings to adjust, identify and capture peak pressures
  • A patented housing design which is resistant to high levels of impact and vibration in the workplace
  • Prevents the entry of fluid by the design which includes an angled connector (again patented), a base, the presence of drain holes for fluid, and sealing of connector pins

The relevant patent numbers are:

  • EU Patent No. 002334250-001
  • CN Patent ZL 201330 527540.1
  • US Patents D711266 , US 9,607,596 B2

Operating and other relevant parameters

The performance of the Model 511 hammer union pressure transmitter is summarized below:

. .
Full Scale Pressure Ranges 0-5 K, 0-6 K, 0-10 K, 0-15 K, 0-20 K PSIS
Combined Accuracy (BFSL) (Non-Linearity, Hysteresis & Repeatability)
≤ ± 0.25% FSO
Full Scale Output (FSO) 16.00 mA ±1% FSO @70 °F
Zero Balance. 4 mA ±1% FSO @70 °F
Compensated Temperature Range -40 °F to 140 °F (4 °C to 60 °C)
Operating Temperature Range -40 °F to 185 °F (-40 °C to 85 °C)
Storage Temperature Range -67 °F to 302 °F (-55 °C to 150 °C)
Long Term Stability (%FSO) ≤ ± .25% FSO per 6 months
Thermal Effect on Zero ≤± 1% FSO per 100 °F Typical
Thermal Effect on Span ≤± 1% FSO per 100 °F Typical


The electrical features are as follows:

. .
Output Signal 4-20 mA @70 °F
Supply Voltage 9-28 Vdc
Power Supply Regulation <± .01% FSO per volt
Load Impedance 900 ohms @ 28 VDC decreasing linearity to 0 ohms @ 9 VDC
Circuit Protection Reverse polarity protected
RFI / EMI <1% FSO output change with 3 V Rms from 150 kHz to 80 MGz

(80% AM modulated at 1 kHz) applied to power supply and signal lines

[IEC 61000-4-6 radio frequency common mode immunity],

1% output change when exposed to a radiated electromagnetic field of 10 V/m from 80 MHz to 1 GHz AM modulated at 1 kHz and 3 V/m

1.4 GHz to 2.7 GHz. [IEC 61000-4-3 Radiated electromagnetic field immunity]
Voltage Spike Protection Withstand 1000 volt spike per EN 61000-4-5
Insulation Resistance < 5 nS
Response Time < 1 millisecond to reach 90% of FSO
Range Calibration Signal 100% FSO ±10% by exciting pins E&F
Calibration Power Supply Voltage 8.5 -28 VDC
Calibration Signal Accuracy Readings on calibration certificate are within ±0.2% FSO of actual Cal signal output
Bridge Resistance 10 K ohms, nominal
Standard Electrical Connection Mates with 6 pin, Hermetic, Box Mount, Shell Size 10, MIL-C-26482 bendix type connector
PIN OUTS PIN A   + Power / Signal
PIN B   - Power / Signal
PIN C   No Connection
PIN D   No Connection
PIN E    + Calibration
PIN F    - Calibration


The mechanical properties of the model 511 are shown in the following table:

. .
Standard Pressure Port Male hammer union 2 inch #1502
Pressure Cavity Volume Standard: 0.45 cubic inches
Option "TP" : 0.22 cubic inches
Zero Effect from Installation 0.3% FSO w/200 ft-lbs torque on union #1502
Shock Sensitivity 1000 g, 0.5 ms half sine wave pulse shall not cause change in calibration
Proof Pressure 1.67X range or 22,500 PSI max
Burst Pressure 3 Times full scale pressure range, limited by union #1502: 22.5 K PSI


The materials from which the model 511 hammer union pressure transmitter is constructed are tabulated below:

. .
Wetted Materials NACE compliant Inconel 718 (MR0175/ISO 15156-3:2009(E))
Enclosure Material 304 Stainless Steel
Identification Laser marked on body of unit
Enclosure Rating IP68*, NEMA 6P*
Weight 5.6 lbs. nominal

* Pending approvals

Several options are available for the client to choose from:

. .
DC Compensated temperature -40 °F to 140 °F
DG Improved temperature compensation
DH Special Range
DN Improved accuracy
EA Special Calibration Run
EH Compensated temperature range 40 °F to 180 °F
LW Narrow adapter for banding
NA Carrying handle attached
NH Customer specific identification
NP Protective ring cage
NQ Protective criss-cross cage
QJ 17-4 PH wetted material, heat treated per NACE MR0175-2000
Z() Special connectors


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