Most compact Earthquake Monitoring System which provides the Alarm Signal when the Earthquake occurs. Employment of the precision Servo type Accelerometer ensures the accurate Earthquake Monitoring in spite of that it is a kind of popular priced products.
Features
Reliable Accuracy
If the Control Output of the equipments for secondary disaster prevention lacked its reliability, some problems as No or Erroneous safety operations might be caused. The Servo type Accelerometers build in these IMV Earthquake Monitoring systems are of precision high accuracy to achieve Display and Alarm Setting by as fine as 1 G Step.
Preparation for Large-scale Earthquakes
The Peak of Motion in any direction can be surely captured by Vector Composition of the Accelerations detected by the Accelerometers allied in three directions. The Measurable Acceleration Range up to 3000 Gal fulfills requirements to prepare the Large-scale Earthquakes.
Waterproof free from installation place concern
Motions of Earthquake vary from ground to structure, building to building. It is ideal to install the detector of the Earthquake Monitoring system on the very basement of the important facility which is aimed to be protected from the Earthquake. The detectors of these systems employ the IP67 equivalent waterproof structure to allow to be installed outdoor or dusty environments.
Free from long-time installation works
4 anchor bolts are needed to be fixed for the conventional detectors. While, for these newly developed detectors, bolt adjustment is easy because of the fixing spots reduced to 2 and the cut-out holes located there. Voltage for Power Source is 24Volts which is usually available in the instrumentation racks.
Compact Design
The Detectors are smaller the better if they are needed to be checked on occurrence of the earthquake.
SW-72・72R detectors not only small in size but also they have low cable lead out positions and edge less structures for easy installation.
Applications
Installation in a Control cabinet
Compact design allows to be installed on Concrete floor in a Control cabinet.
Safety Stop ・ Shutdown of Machineries
Waterproof structure allows monitoring in right vicinity of Machineries.
Low cost Multi-point Monitoring
Detector build-in type provides Low cost 2 out of 3 Systems or Multi-point Monitoring. (Combination with SW-74S is possible flexibly.
System Composition
Outward Drawing
Specifications
| Model | SW-72 |
|---|---|
| Detecting Method | Omni-directional non-directivity detection by vector product acceleration |
| Frequency Range | 0.3-10Hz (±10％） |
| Acceleration Range | 0 – 5000 Gal (3-component vector product) NS, EW direction : ±3000Gal, UD direction : +2000 – 4000Gal |
| Low Pass Filter | 30Hz(-3dB), 4th butterworth |
| A/D Converter | 16bit, 100Hz sampling |
| Indication | 7-segment LED, 4-digit display (xxx.x or xxxx) |
| Alarm Step | Upper limit 3-step (ALM1 – 3) individual setting |
| Alarm Setting Value | Acceleration 0.1 – 999.9Gal *1 |
| Alarm Contact | 1a contact (Photo MOS relay, COM common) Contact rating 200V-0.65A (common for AC/DC, peak value) Relay : made by panasonic, PD1a type (AQY277A) |
| Alarm Reset Method | a. External reset terminal (all step reset by no-voltage a contact) b. Automotac reset by built-in timer 1-9999sec., Setting interval: 1-sec., 0 is automatic reset OFF |
| DC Output | 4-20mADC, Load resistance ≦300Ω Full scale : 10-3000Gal (Setting interval : 1Gal) |
| Serial I/F | Communication with SW-74 (Conforms to RS422) |
| Clock | Accuracy:≦70ppm (6sec/day) |
| Time Connection Input | ±30 sec correction (external input of no-voltage a contact) |
| Ambient Temperature | 0-+50℃ |
| Humidity Range | 10-100％RH |
| Power Supply | 24VDC ±10％ *2 ≦10W |
| Outer Dimensions | See outside view |
| Structure | Water-proof structure (IP67) |
| Material | Aluminum die casting |
| Painted Color | Silver metric |
| Weight | 4Kg |
| Mounting Method | Installation on the ground (fixed with anchor) |
| I/O Cable | Water-proof connector connected One-touch lock connector made by NANABOSHI ELECTRIC MFG NRW-2421PF11 (Outer diameter : 34.1mm approx.) Cable made by Fuji Electric Wire Industries Twisted cable (with sheilded) FKEV-SB 0.3sq × 10 pair Outer diameter : 10.5 mm approx. |
| Built-in accelerometer | |
| Pickup model | VP-5511B/3 |
|---|---|
| Conversion Method | Force balance servo type accelerometer |
| Detection Method | Horizontal 2-direction, Vertical 1-direction |
| Sensitivity | 0.204V (m/s2) ±5％ |
| Frequency Range | 0-100Hz ±10％ 0-30Hz ±3％ |
| Natural Frequency | ≧300Hz |
| Max. Measuring Acceleration | NS, EW direction : ±29.4m/s2 UD direction : -39.2-+19.6m/s2 |
| Linearity | 0.3% full scale |
※1 Initial setting value at factory shipping is 80,250,400 Gal
※2 When connected with SW-74 (74SI), power is supplied from SW-74 (74SI)