Trillium Compact Broadband Seismometer

The Trillium Compact offers low-noise broadband seismometer performance with physical dimensions comparable to geophones. It measures only 5.04 inches in height and requires no mass lock or mass centering.

Its exceptionally high clip level of 26 mm/s permits on-scale recording of larger events closer to the source. It features an Integrated web server for efficient instrument management and ultra-low power consumption of just 160 mW.

The Trillium Compact is available in several variants to facilitate vault, surface or buried downhole deployments.

The 120s variant incorporates a symmetric triaxial force feedback sensor design with a response flat to velocity from 120 seconds to 100Hz.

The 20s version features the same force feedback sensor design with a response flat to velocity from 20 seconds to 100Hz, as well as industry-leading tilt tolerance of 10 degrees, making deployments very fast and efficient in various surface conditions. Several base foot options are available for different terrains.

The Trillium Compact Posthole, available in 120s and 20s variants, features a stainless steel enclosure and waterproof connector ideally suited for downhole deployments.


Nanometrics’ Trillium Compact might be right for you if:

  • You’re looking for the superior performance of a broadband seismometer with the installation convenience of a rugged geophone

  • You want improved noise floor at high frequency

  • You value easy deployment and minimized site preparation

  • You don’t want to sacrifice station reliability for low operating costs






Specifications are subject to change without notice.

Topology Symmetric triaxial
Feedback Force balance with capacitive transducer
Mass centering Not required
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
Connector - surface 14-pin, shell size 12, MIL-C-26482 Series I, top mounted
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 max. 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 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

Diameter 90 mm (3.54")
Height 100 mm (3.93") - body only
Housing Surface resistant to corrosion, scratches and chips

Vertical scribe marks for N/S

Precision N/S-E/W guide in top of cover for straight-edge, line or laser level

Immersion rating IP67
Supply voltage 9 to 36 V DC isolated inputs
Power consumption

<180mW typical (model TC120-SV1)

<195mW typical (model TC20-SV1)


Reverse-voltage and over-voltage protected

Self-resetting over-current protection revision

Operating temperature -40°C to +60°C
Storage temperature -65°C to +75°C

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




Have questions? Not sure which solution is right for you? Contact a Nanometrics expert.