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)
ATEX Zone 0, Zone 2
North America Zone 0, Zone2, Class Div1 and Class 1, Div 2
Designed for long life and accurate, trouble-free performance.
- Lightweight and Robust.
Moisture resistant and drop impact tolerant.
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%|
|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|
|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
|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)