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Trillium Compact Posthole
Summary
Nanometrics industry-leading portfolio of Trillium seismometers now includes a Trillium Compact Posthole for quick and easy deployment. Available in both 120s and 20s variants, the Trillium Compact Posthole features a stainless steel enclosure and waterproof connector ideally suited for downhole deployments.
Specifications
Specifications are subject to change without notice.
TECHNOLOGY |
|
| Topology | Symmetric triaxial |
| Feedback | Force balance with capacitive transducer |
| Mass centering | Not required |
PERFORMANCE |
|
| Sensitivity - 120s | 750V-s/m nominal ±0.5% precision |
| Bandwidth - 120s | -3 dB points at 120 s and 100 Hz |
| Sensitivity - 20s | 750V-s/m nominal ±0.5% precision |
| Bandwidth - 20s | -3 dB points at 20 s and 100 Hz |
| Off-axis sensitivity | ±0.5% |
| Transfer function |
Lower corner pole frequency within ±0.5% of nominal provided
High-frequency poles within 1 dB of nominal up to 45 Hz No peak in response at high frequency |
| Clip level | 26 mm/s from 0.1 Hz to 10 Hz |
| Operational tilt range - 120s | ±2.5° |
| Operational tilt range - 20s | ±10° |
| Parasitic resonance | None below 200 Hz |
| Dynamic range | >152 dB @ 1 Hz |
INTERFACE |
|
| Connector - downhole | 16-pin, underwater SubConn MCBH16MSS, top mounted |
| Velocity output |
±20V peak (40V peak-to-peak differential)
Selectable XYZ or UVW mode |
| Mass position output |
Single voltage output representing maximum mass position
3-channel mass positions available through serial port |
| Calibration input |
Single voltage input and one active high-control signal to enable all 3 channels
Remote calibration in XYZ or UVW mode Independent channel selection by serial port |
DIGITAL COMMAND & CONTROL INTERFACE |
|
| Digital interface |
RS-232 compatible serial IP (SLIP)
Onboard web server standard HTTP |
| Digital commands |
XYZ, UVW mode switching
Calibration channel selection (off, enable all, U, V or W) Short/long period mode Firmware updates State-of-health request |
| Digital data outputs |
Independent mass position values Instrument temperature Factory sensitivity User calibration data (poles and zeroes) Instrument serial number and firmware revision |
PHYSICAL |
|
| Diameter | 97 mm |
| Height |
160 mm (body and connector)
167 mm (on fixed studs) 230 mm (on optional 70 mm spikes) |
| Weight | 3.3 kg |
| Housing | Stainless steel surface, resistant to corrosion, scratches and chips |
| Alignment |
Vertical scribe marks for N/S
Case-top north/south guide for straight-edge, line, or laser level |
| Immersion rating | Rated to IP68 for full submersion |
POWER |
|
| Supply voltage | 9 to 36 V DC isolated inputs |
| Power consumption | <180mW typical (model TC120-PH2)
<195mW typical (model TC20-PH2) |
| Protection |
Reverse-voltage and over-voltage protected
Self-resetting over-current protection revision |
ENVIRONMENTAL |
|
| Operating temperature | -20°C to +60°C (ultra-low temperature option available, contact Nanometrics) |
| Storage temperature | -40°C to +70°C |
| Shock |
100 g half sine, 5 ms without damage, 6 axes
No mass lock required for transport |
| Magnetic | Insensitive to natural variations of the earth's magnetic field |
Performance
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