Seismic Transmitter

Seismic Transmitter

The Seismic Transmitter provides a 4-20 mA signal proportional to the 0-1 inch/sec 0-pk velocity movement of a roller element bearing housing or machinery housing. It is designed for use on non-critical machines. The transmitter automatically integrates the acceleration signal on the machine to vibration prior to sending the signal to the controller. The Seismic Transmitter also has a dynamic acceleration waveform output for advanced diagnostics that is accessible at the non-sensor end of the field wiring through either a patch panel or some other wiring technique. Ideally, you should use the 990 Test Adapter when capturing or viewing dynamic waveforms from the patch panel.



  • Two available signals
    Primary 4 to 20 mA Velocity (0-1 IPS, 10-1,000 Hz, rms, 4-20mA)
    Secondary (for diagnostics) Dynamic Output Acceleration (Unbuffered 100 mV/g, 4- 10,000 Hz)
  • Multi-Approved
    ATEX Zone 0, Zone 2
    North America Zone 0, Zone2, Class Div1 and Class 1, Div 2
  • Reliable.
    Designed for long life and accurate, trouble-free performance.
  • Lightweight and Robust.
    Moisture resistant and drop impact tolerant.
  • Compatibility.
    A two-wire, 4-to 20 mA dc signal loop ensures compatibility with virtually all types of control and monitor systems.
  • Easy Implementation.
    No field configuration or adjustments.
  • Safety Compliant.
    Safe and ergonomic design; approvals support access to hazardous areas.
  • Temperature Performance
    -40 °C to +85 °C (-40 °F to +185 °F)
  • Simple Platform
    Industry Standard Interfaces

Transmitters do not supply the level of data required to diagnose machine problems, however, they are a practical solution in some applications for measuring general vibration levels.When integrated into control or monitoring systems, measurements supplied via transmitter systems are a valuable tool for overall vibration trending. The 177230 Seismic Transmitter is targeted for use on auxiliary or general-purpose machinery assets with rolling element bearings such as motors and small reciprocating compressors where advanced diagnostic ability is not financially justifiable.


Sensitivity – Main loop (Signal One) 0.0 to 25.4 mm/s (0 to 1.0 in/s) ± 10%, broadband rms (root mean square)
[4 mA equals 0.0 mm/s and 20 mA equals 25.4 mm/s]
Output Format, Pin A Referenced to Pin B 4 to 20 mA current loop Velocity vibration
Excitation Voltage 12 to 30 Vdc (current limited to 40 mA)
Note: This product is for use with PLCs, DCS and SCADA systems that have internal power supply that are typically current limited in the range of 30 mA to 35 mA.
Settling Time Less than 15 seconds within 2% of final value
Connector Wiring Convention Pin A: 4-20 mA Positive Loop
Pin B: 4-20 mA Negative Loop and common for Dynamic Signal
Pin C: Dynamic Signal in voltage, unbuffered
Frequency Response 10 Hz to 1 kHz (600 cpm to 60 kcpm) ± 10%
Sensitivity – Dynamic Signal (Signal Two) 10.2 mV/m/s2 (100 mV/g) ± 5%
Output Format, Pin C Referenced to Pin B Voltage, Acceleration vibration
Note: The Dynamic Signal Negative (Pin B) requires isolation from any grounding. If this terminal is grounded, the 4-20 mA loop will short, resulting in no output.
Frequency Response 2.5 Hz to 10 kHz (150 cpm to 600 kcpm) ± 10%
Linearity ±1%
Output Bias Referenced to Pin B 2.5 V ± 0.1 V
Full Scale Range 196m/s2 (20 g’s) peak
Velocity Range 420 mm/s (16.5 in/s) peak
Mounted Resonant Frequency Greater than 12 kHz
Transverse Sensitivity Less than 5% of sensitivity
Sensing Element Type Ceramic / Shear

Environmental Limits

Operating Temperature Range -40 °C to +85 °C (-40 °F to +185 °F)
Electrical Isolation Greater than 108 ohms
Isolation Breakdown Voltage 600 Vrms with less then 1 mA leakage current
Shock Survivability 9.810 m/s2 (1.000 g peak), maximum drop test
Note: This part typically mounts directly to the machine via a stub. Customers can use this device with a mag-base, but must take care not to “snap” the unit onto the machine. This snapping action can create a very large spike signal that can damage the electronics. Rolling the mag-base onto the machine greatly reduces the spike signal so that the unit should not have any issues.
Sensor Seal Hermetically sealed
Relative Humidity of Transmitter To 100% non-submerged
Magnetic Field Sensitivity Less than 20 µm/s/gauss (790 µin/s/gauss) peak
Less than 14.7 mm/s2/gauss (150 µg/gauss) peak
[base on 50 gauss, 50 - 60 Hz]


Weight 131 g (4.62 oz), typical
Diameter 25.4 mm (1.00 in)
Height 66.0 mm (2.60 in)
Case Material 304L stainless steel
Connector 3-pin MIL-C-5015, stainless steel
Mounting Hole in Body 1/4-28 UNF
Mounting Threads 3/8-24 UNF
¼-18 NPT
¼-28 UNF
Mounting Torque 4 to 7 N-m (35.4 to 62.0 in-lbf)
Connector Wiring Convention Pin A: 4-20 mA Loop Power (Positive with reference to Pin B)
Pin B: 4-20 mA Loop Return (Negative/ return for Dynamic Signal)
Pin C: Dynamic Signal (Unbuffered, referenced to Pin B)

Descriptions English
Seismic Transmitter Datasheet Seismic Transmitter Datasheet
Seismic Transmitter Fact sheet Seismic Transmitter Fact sheet