- HOME>
- Products>
- Seismometers>
- Seismic monitoring system (SW-52EX / SW-52ST)
Seismometers
Flame-proof / dust-ignition-proof
Seismic monitoring system (SW-52EX / SW-52ST)
- Uses high resolution servo accelerometer which can detect microearthquakes
- SW-52EX / SW-52ST can provide alarm outputs for control in the event of an earthquake on gas and dust explosion areas such as petrochemical or hydrogen plants, manufacturing plants, etc. High resolution servo accelerometer enables to prevent secondary disasters caused by earthquakes.

Features
-
- ■ Reliable accuracy
Built - in servo type accelerometer is also used for detection of micro-tremor. Both indication setting and alarm setting is 1 gal step.
-
- ■ Waterproof structure
It is ideal to install the seismometer on the common foundation to catch the motion of earthquake correctly. SW-52EX / 52ST adopts IP67 waterproof structure which is able to be installed outside or dusty environments.
-
- ■ Available to large-scale earthquake monitoring
- The peak of motion in any direction can be surely captured by vector composition of the accelerations detected by the accelerometers arranged in three directions. The measurable acceleration range up to 5000 gal prepare against the large-scale earthquake.
-
- ■ Flame-proof structure
* Only SW-52EX - The container is constructed to withstand the pressure when explosive gas explosion occurs and not to catch fire.
- ■ Flame-proof structure
-
- ■ Standard communication method
- RS-485(ModBus)is adopted.
System composition
Flame-proof / dust-ignition-proof specification
Certification | Ex db IIB+H2 T6 Gb (IECEx, ATEX), Ex d IIB+H2 T6 Gb (TIIS) Ex tb IIIC T120℃ Db (IECEx, ATEX,TIIS) |
|
---|---|---|
Certification No. |
IECEx DEK 16.0004X DEKRA 16ATEX0005 X TIIS TC22341X |
|
Compliance standard |
IECEx | IEC 60079-0:2011 IEC 60079-1:2014-06 IEC 60079-31:2013 |
ATEX | EN 60079-0:2012+A11 EN 60079-1:2014 EN 60079-31:2014 |
|
TIIS | Explosion-protected electrical installations in general industries JNIOSH-TR-46-1:2015 JNIOSH-TR-46-2:2015 JNIOSH-TR-46-9:2015 |
Classification of explosive gas
450°C≧ T1 >300°C | 300°C≧ T2 >200°C | 200°C≧ T3 >135°C | 135°C≧ T4 >100°C | 100°C≧ T5 >85°C | 85°C ≧ T6 | |
---|---|---|---|---|---|---|
ⅡA | NH3, CO, C2H6, C7H8, C3H8, CH4 |
C2H6O, C4H10O, C4H10, C5H8O2, (C2H3Cl)n |
C6H14, gasoline, Kerosene, C5H12 |
C2H4O, C3H9N | Ethyl nitrite | |
ⅡB | HCN, C3H3N, Coal gas |
C4H4O, Ethyl acrylate, C2H4 |
C2H6O, C6H12, C5H8 |
|||
ⅡC | H2 | C2H2 | CS2 | C2H5NO3 |
Main explosive gas targeted by this product
Classification of explosive dust (GroupⅢ)
Type of dust | Electric resistance | Representative materials | |
---|---|---|---|
ⅢA | Combustible flyers Size > 500 μm |
― | Textiles such as rayon, cotton, sisal hemp, jute |
ⅢB | Non-conductive dust Size ≦ 500 μm |
Electric resistance > 103Ωm | Powder such as cereal flour, sugar, toner, synthetic resin powder |
ⅢC | Conductive dust Size ≦ 500 μm |
Electric resistance ≦ 103Ωm | Metal powders such as carbon black, aluminum, magnesium |
Outward dimensions
Specifications
Item | Specification | |||
---|---|---|---|---|
Detection method | All-directional detection based on vector composition acceleration | |||
Built-in pickup | Force-balancing servo acceleration pickup | |||
Frequency range | 0.3 to 10 Hz ±10 % | |||
Acceleration measurement |
Maximum range | 0 to 5000 Gal (composite value of 3-component vector) NS and EW axes : ±3000 Gal / UD axes : +2000 to -3000 Gal |
||
Frequency range | 0.3 to 10 Hz ±10 % | |||
SI value measurement |
Maximum range | 0 to 5000 Gal (composite value of 3-component vector) Cycle : 2 seconds, 5000 Gal, Damping : 2%) | ||
Cycle range | 0.1 to 2.5 seconds Real-time calculation of speed response spectrum at measuring acceleration through twenty-five simulation filters with 1-degree of freedom, Inherent cycle : 0.1 sec. step |
|||
Damping | 2 to 30 % (Arbitrary setting in 1 % step) | |||
Low pass filter | 30 Hz (-3 dB), 4th butterworth | |||
A / D converter | 24 bit, 100 Hz sampling | |||
Seismic intensity scale calculation method | Modified Mercalli intensity scale (PGA estimated value) | |||
Analog output | 4 to 20 mA DC x 2 pcs (Load resistance : 300 Ω or less) Selection of “Acceleration”, “SI” or “MMI scale” for each output | |||
MMI scale : Full-scale is fixed, 10-level output in 1.6 mA step | ||||
Relay output | 1a contact (Photo-MOS relay) Contact rating : 40 V, 0.8 A (For AC and DC, peak value) Output content : “Seismic alarm” or “FAULT alarm” can be selected |
|||
Digital output | Open-collector output × 3 pcs. (D-GND is common) Output rating : 30 V, 50 mA Output content : “Seismic alarm” or “FAULT alarm” can be selected. |
|||
Alarm | Seismic alarm | Alarm is output when the system detects earthquake and the measured value exceeds a preset level. Upper limits of 4 levels (Digital output 1 to 3, Relay output) can be individually specified. Output factor : “Acceleration” or “SI value” can be selected Output level : 0.1 to 999.9 (Gal / Kine) 0.1 step, 0.0: Alarm is OFF Reset time: 1 to 9999 seconds, 1-sec. step 0 sec. : Auto-reset is disabled |
||
FAULT alarm | The alarm is output at detection of any of the following errors “Hardware self-diagnosis”, “Pickup self-diagnosis”, “Pickup test” or “System power failure” | |||
Seismic alarm reset | Internal timer or digital input (Digital input setting is required) | |||
Digital input | Open-collector or non-voltage contact input x 1 pcs. (D-GND is common.) Open voltage : Approx. 13 V (ViH: 2.4 V or more, ViL: 0.8 V or less) Input pulse width : 0.1 sec. or more Function can be changed depending on communication setting: [Seismic alarm reset / Time correction / Pickup test execution] |
|||
Serial I/F | Communication with host : Measurement data collection, system setting change, status monitoring, pickup test execution, digital input function changeover Interface : RS-485 (2-wire type half-duplex communication) Communication speed : 115,200 bps Protocol : Modbus (RTU mode) |
|||
Clock | Accuracy | 20 ppm (monthly error: 50 seconds) or less | ||
Calibration | ±30 sec. correction using digital input (Digital input setting is required) | |||
Operational temperature range | 0 to + 50 ℃ | |||
Operating humidity range | 10 to 100 %RH (non-condensing) | |||
Power supply | DC 24V ±10 % 10 W or less | |||
Structure | Aluminum | |||
Installation method | Installation on the ground (fixed by anchor) | |||
Construction | SW-52EX | Ex db IIB+H2 T6 Gb (IECEx, ATEX), Ex d IIB+H2 T6 Gb (TIIS) Ex tb IIIC T120℃ Db (IECEx, ATEX,TIIS) |
SW-52ST | IP67 (Dustproof, watertight structure) |
Mass | Approx. 5 kg | Approx. 2 kg | ||
I/O cable | Cable ground (Internal terminal block connection) | Connection with waterproof connector |