 |
|
High Performance Broadband Seismometer
Low Self-Noise Over a Wide Bandwidth
Portable Design
Low Power Consumption
Force-Balance Electronic Feedback
Robust Mass Locking Mechanism
Easy Installation
Local and Regional
Broadband Surface or Posthole Installation
|
|
|
The 151-60 Broadband Seismometer, "Observer", is a force-balance feedback sensor with frequency bandwidth 0.0166 Hz (60 sec) - 50Hz flat to velocity.
Note: Optional response from 0.0333 (30 sec) to 50 Hz is available at the customer's request. Please contact REF TEK for more information.
The 151-60 contains three independent sensors (one vertical and two horizontal) with built-in electronic feedback circuit, control and power conversion circuits, featuring low noise, large dynamic range and easy installation and use.
The 151-60 has built-in leveling and mass lock/unlock facilities. The leveling mechanism includes two bubble levels, three adjustable feet and three locknuts which are located on the seismometer’s chassis (see photo below). The leveling feet are accessible from the top of the case, which makes the Observer an ideal seismometer for both surface and posthole installation. The leveling is performed by a 10'' T-type Allen wrench (see photo below).
The 151-60 has a built-in mass zero-position adjusting mechanism to perform mass adjustment on power-up or upon remote user command. As soon as the seismometer is powered it checks the zero position of each component’s mass and automatically adjusts the zero position if needed. Monitoring and adjustment of the mass can also be performed via the 130 family High Resolution Recorders using the internal Sensor Control Board, P/N RT527-B01.
 |
| . |
|
|
The 151-60 is a low noise seismometer (see Power Spectral Density plot below).
| Sensor Type |
3 component, orthogonal
|
| Feedback |
Force balance with capacitive displacement transducer |
| Frequency Response |
Flat to velocity from 0.0166 Hz (60 sec) to 50 Hz (see diagram in manual)
Note: Optional response from 0.0333 (30 sec) to 50 Hz is available at the customer's request. Please contact REF TEK for more information.
|
| Sensitivity |
2000 V/m/s |
| Output Signal |
+/- 20 V peak-to-peak differential |
| Dynamic Range |
>140 dB @ 5Hz |
| Output Impedance |
<100 Ohms |
| Calibration |
Coil resistance 1,000 Ohms, sensitivity: 10 m/s2/A |
| Leveling |
Two Integrated bubble levels. Three adjustable leveling feet with locknuts |
| Mass Position |
Remote monitoring and adjustable zero-point using 3 independent voltage outputs |
| Mass Locking |
Mechanical lock/unlock on outside of the case |
| Distortion |
Total distortion less than -80 dB |
| Cross Axis Coupling |
< 1% |
| Mechanical Zero |
No need for adjustment within ambient temperature fluctuation +/- 20o C |
| Power-Fail Protection |
Built-in |
| Signal Overload Protection |
Built-in |
| Auto-recovery Time |
Full operation recovery within 10 minutes after either power fail or signal overload |
| Supply Voltage |
9 to 18 VDC |
| Operating Temperature |
-20o C to +60o C |
| Power Consumption |
<1.3 W |
| Water Tight Integrity |
IP67 for outdoor use and immersion resistance |
| Case |
Aluminum, Powder Coated |
| Dimensions |
Diameter: 9.45 " (24 cm); Height: 10.6 " (27 cm) |
| Weight |
26.4 lbs (12 kg) |
| Connector |
PTO2A 14-19S |
| Alignment |
Removable orientation North/South pins screw into the base (Brass for North, Silver for South) |
| Accessories (optional) |
Rugged transportable hardigg case. Flexible insulation bag (P/N 151-9800) |
The standard Observer kit includes: a) Seismometer; b) T-type Allen wrench key for leveling; c) Aluminum carrying case with pre-cut foam; d) orientation pins
The Observer is available with an optional ruggedized transportation case1) and thermal insulation bag2)
1) Ruggedized transportation case for multiple shipments
 |
The Observer's transportation case is a ruggedized, durable, lockable case with handles and removable casters, designed for multiple shipments by any means of transportation in a harsh environments
|
| . |
 |
The transportation case has pre-cut foam to house the 151 Observer with carrying case, removable casters and accessories, including
|
| . |
 |
sensor's cable and thermal insulation bag 2)
|
2) Thermal insulation bag
 |
The Observer thermal insulation bag is fabricated from Microfleece material with primaloft insulation, providing protection from wind and daily temperature fluctuations in the vault to insure the highest quality data.
|
return to top
|
