Silicon Designs Model 2240 Hermetically Sealed Analog Accel with Removable Plug & Cable
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SILICON DESIGNS, INC. Model 2240 Advanced Accelerometer Solutions Hermetic Analog Accelerometer Module Hermetically Sealed Titanium Case Detachable Cable (sold separately) Capacitive Micromachined Nitrogen Damped ±4V Differential Output or 0.5V to 4.5V Single Ended Output Fully Calibrated Low Power Consumption -55 to +125°C Operation +9 to +32V DC Power Simple Four Wire Connection Low Impedance Outputs Will Drive Up To 50 Feet of Cable Responds to DC and AC Acceleration Non Standard g Ranges Available Low Noise Serialized for Traceability Available Cables Cable Cable Length Model Number 4 ft 2240-CAB-04 14 ft 2240-CAB-14 33 ft 2240-CAB-33 50 ft 2240-CAB-50 Available G-Ranges Model Full Scale Number Acceleration ±2g 2240-002 ±5g 2240-005 ± 10 g 2240-010 ± 25 g 2240-025 ± 50 g 2240-050 ±100 g 2240-100 ±200 g 2240-200 ±400 g 2240-400 DESCRIPTION The model 2240 accelerometer is a hermetically sealed version of the model 2220. This rugged module combines an integrated model 1221L accelerometer with high drive, low impedance buffering for measuring acceleration in commercial/industrial environments. It is tailored for zero to medium frequency instrumentation applications. The titanium case is sealed using a laser welding process and is easily mounted via two #4 (or M3) screws. On-board regulation is provided to minimize the effects of supply voltage variation. It is relatively insensitive to temperature changes and gradients. A model 2240-CAB cable, sold separately (see order information above), connects via a miniature 4-pin screw-on connector. The cable’s shield is electrically connected to the titanium case while the ground (GND) wire is isolated from the case. An initial calibration sheet (2240-CAL) is included and periodic calibration checking is available. OPERATION The Model 2240 accelerometer module produces two analog voltage outputs, which vary with acceleration as shown in the graph on the next page. The sensitive axis is perpendicular to the bottom of the package, with positive acceleration defined as a force pushing on the bottom of the package. The signal outputs are fully differential about a common mode voltage of approximately 2.5 volts. The output scale factor is independent from the supply voltage of +9 to +32 volts. At zero acceleration the output differential voltage is nominally 0 volts DC; at "full scale acceleration the output differential voltage is "4 volts DC respectively. nominally 0 volts DC; at "full scale acceleration the output differential voltage is "4 volts DC respectively. 5 OUTPUT VOLTAGE APPLICATIONS • Flight Tests • Vibration Monitoring • Vibration Analysis • Machine Control • Modal Analysis • Robotics • Crash Testing • Instrumentation 4 AO N P AO 3 2 1 0 -Full Scale 0 + Full Scale ACCELERATION SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE th Silicon Designs, Inc. • 13905 NE 128 Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446 www.silicondesigns.com [page 1] September 2012

Model 2240 SIGNAL DESCRIPTIONS 1.00 [25.4] 0.825 [20.95] Vs and GND (Power): Red and Black wires respectively for the 2240-CAB cable (ordered separately). Power (+9 to +32 Volts DC) and ground. 0.31 [7.9] 1/4-28, 4-PIN CONNECTOR SILICON DESIGNS 2240-XXX S/N XXXX 1.00 [25.4] AOP and AON (Output): Green and Yellow wires respectively for the 2240-CAB cable (ordered separately). Analog output voltages proportional to acceleration; AOP voltage increases (AON decreases) with positive acceleration. At zero acceleration both outputs are nominally equal to 2.5 volts. The device experiences positive...

Model 2240 up to 50 feet (15 meters) can be used without the need to test for output instability. For lengths longer than 50 feet, we recommend you check each individual installation for oscillation by tapping the accelerometer and watching the differential output for oscillation in the 20kHz to 50kHz region. If no oscillation is present then the cable length being used is OK. From the standpoint of output current drive and slew rate limitations, the model 2240 is capable of driving over 2000 feet (600 meters) of its cable type but at some length between 50 and 2000 feet, each device will...