Seismometers

Seismic Monitoring System

(SW-52EX / SW-52ST / SW-7033)

Uses high resolution servo accelerometer which can detect microearthquakes

This is an seismic monitoring system that employs a high-precision servo-type acceleration sensor to
obtain an alarm output for control during an earthquake.
SW-52EX can be used in gas/dust explosion-proof areas such as petrochemical/hydrogen plants and
manufacturing plants to minimize 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.

Dust-proof and waterproof structure

It is ideal to install the seismometer on the common foundation to catch the motion of earthquake correctly. IMV seismic monitoring systems adopt 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.

Standard communication method

RS-485(ModBus)is adopted.

System Composition

SW-52ST uses a servo acceleration sensor, and SW-7033 uses a MEMS acceleration sensor.
By adopting a MEMS acceleration sensor, the SW-7033 is cheaper than the SW-52ST.

Flame-proof / dust-ignition-proof specification (SW-52EX)

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

Explosion-proof performance display

Group：ⅡA，ⅡB，ⅡCC
Temperature class：T1，T2，T3，T4，T5，T6

	450℃ ≧ T1 ＞ 300℃	300℃ ≧ T2 ＞ 200℃	200℃ ≧ T3 ＞ 135℃	135℃ ≧ T4 ＞ 100℃	100℃ ≧ T5 ＞ 85℃	85℃ ≧ T6
ⅡA	NH3, CO, C2H6, C7H8, C3H8, CH4	C2H6O, C4H10O, C4H10, C5H8O2,	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