General Description
The ALTA Wireless Accelerometer – Impact Detect Sensor is a digital, low-power, low-profile, capacitive sensor that is able to measure acceleration on three axes to detect impact over a set g-force threshold.
Principle of Operation
The ALTA Wireless Accelerometer – Impact Detect Sensor activates when g-forces are exceeded by a user defined threshold—up to 8 g-force. The user can key in the desired threshold for the g-force trigger. This sensor has two operation modes that can be also selected
Features of Monnit ALTA Sensors
• Wireless range of 1,200+ feet through 12+ walls *
• Frequency-Hopping Spread Spectrum (FHSS)
• Improved interference immunity
• Improved power management for longer battery life **(12+ years on AA batteries)
• Encrypt-RF® Security (Diffie-Hellman Key Exchange+AES-128 CBC for sensor data messages)
• Onboard data memory stores up to 512 readings per sensor:
– 10-minute heartbeats = 3.5 days
– 2-hour heartbeats = 42 days
• Over-the-air updates (future proof)
• Free iMonnit basic online wireless sensor monitoring and notification system to configure sensors, view data and set alerts via SMS text and email
*Actual range may vary depending on environment.
**Battery life is determined by sensor reporting frequency and other variables. Other power options are also available.
ALTA Commercial Coin Cell Wireless Accelerometer – Impact Detect | Technical Specifications
| Supply voltage | 2.0–3.8 VDC * | |||||
| Current consumption | 0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle), 2.5 mA | |||||
| (MCU active), 5.5 mA (radio RX mode), 22.6 mA (radio TX mode) | ||||||
| Operating temperature range (board circuitry and coin cell) | -7°C to +60°C (20°F to +140°F) ** | |||||
| Optimal battery temperature range (coin cell) | +10°C to +50°C (+50°F to +122°F) | |||||
| Sensitivity | 4096 count/g | |||||
| Sensitivity range selections | +/-2 G, +/-4 G, +/-8 G | |||||
| Measurement accuracy | ±2.5 % (force: X, Y, Z) | |||||
| Minimum g-force to turn on/wake up | 0.050–0.100 g | |||||
| Fastest update interval/heart rate in any configuration | Heartbeat: 1 minute | |||||
| Bandwidth for data measurement | 800 Hz | |||||
| Integrated memory | Up to 512 sensor messages | |||||
| Wireless range | 1,200+ ft non-line-of-sight | |||||
| Security | Encrypt-RF® (256-bit key exchange and AES-128 CTR) | |||||
| Weight | 0.7 ounces | |||||
ALTA Commercial AA Wireless Accelerometer – Impact Detect | Technical Specifications
| Supply voltage | 2.0–3.8 VDC (3.0–3.8 VDC using power supply) * | ||||
| Current consumption | 0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle), 2.5 mA | ||||
| (MCU active), 5.5 mA (radio RX mode), 22.6 mA (radio TX mode) | |||||
| Operating temperature range (board circuitry and batteries) | -18°C to 55°C (0°F to 130°F) using alkaline | ||||
| -40°C to 85°C (-40°F to 185°F) using lithium ** | |||||
| Optimal battery temperature range (AA) | +10°C to +50°C (+50°F to +122°F) | ||||
| Sensitivity | 4096 count/g | ||||
| Sensitivity range selections | +/-2 G, +/-4 G, +/-8 G | ||||
| Measurement accuracy | ±2.5 % (force: X, Y, Z) | ||||
| Minimum g-force to turn on/wake up | 0.050–0.100 g | ||||
| Fastest update interval/heart rate in any configuration | Heartbeat: 1 minute | ||||
| Bandwidth for data measurement | 800 Hz | ||||
| Integrated memory | Up to 512 sensor messages | ||||
| Wireless range | 1,200+ ft non-line-of-sight | ||||
| Security | Encrypt-RF® (256-bit key exchange and AES-128 CTR) | ||||
| Weight | 3.7 ounces | ||||
ALTA Industrial Wireless Accelerometer – Impact Detect | Technical Specifications
| Supply voltage | 2.0–3.8 VDC (3.0–3.8 VDC using power supply) * | ||
| Current consumption | 0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle), 2.5 mA | ||
| (MCU active), 5.5 mA (radio RX mode), 22.6 mA (radio TX mode) | |||
| Operating temperature range (board circuitry and battery) | -40°C to +85°C (-40°F to +185°F) ** | ||
| Included battery | Max temperature range | -40° to +85°C (-40° to +185°F) | |
| Capacity | 1500 mAh | ||
| Optional solar feature | Solar panel | 5VDC/30mA (53mm x 30mm) | |
| Charging temperature range | 0° to 45°C (32° to 113°F) | ||
| Max temperature range | -20° to 60°C (-4° to 140°F) | ||
| Included rechargeable battery | 600 mAh/>2000 charge cycles (80% of initial capacity) | ||
| Solar efficiency | Optimized for high and low-light operation *** | ||
| Charging efficiency | 40% **** | ||
| Luminous sustainability | 250 LUX **** | ||
| Sensitivity | 4096 count/g | ||
| Sensitivity range selections | +/-2 G, +/-4 G, +/-8 G | ||
| Measurement accuracy | ±2.5 % (force: X, Y, Z) | ||
| Minimum g-force to turn on/wake up | 0.050–0.100 g | ||
| Fastest update interval/heart rate in any configuration | Heartbeat: 1 minute | ||
| Bandwidth for data measurement | 800 Hz | ||
| Integrated memory | Up to 512 sensor messages | ||
| Wireless range | 1,200+ ft non-line-of-sight | ||
| Security | Encrypt-RF® (256-bit key exchange and AES-128 CTR) | ||
| Weight | 4.7 ounces | ||
| Enclosure rating | NEMA 1, 2, 4, 4x, 12 and 13 rated, sealed and weather proof | ||
| UL rating | UL Listed to UL508-4x specifications (File E194432) | ||
Example Applications
• Impact Dection
• Impact Load Sensing
• Many additional applications
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