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Discontinued Products
Wireless Water Temperature Sensors
The ALTA Wireless Water Temperature Sensor uses a sealed, type NTC thermistor with 3 ft lead wires to measure water temperature.
• Accurate to ± 1° C (± 1.8° F)
• Increased accuracy by user calibration to ± 0.25° C (± 0.45° F)
• Probe temperature range of -40°C to +100°C (-40°F to +212°F)
• Sealed, 3 ft leaded wires
Principle of Operation
The ALTA Wireless Water Temperature Sensor can collect temperature data of water or other non-combustible liquids using a sealed NTC thermistor with 3 foot lead wires. The sensor is programmed to sleep for a user defined time interval (heartbeat) and then wakeup, send power to the NTC Thermistor and wait for it to stabilize, and convert the analog data, mathematically compute the temperature and transmit the data to the gateway. To stay within the abilities of the processor, the temperature is computed off a data table provided by the manufacturer. To reduce error, a variable resistor configuration is implemented over specified temperature ranges. Temperature data can be displayed in degrees Fahrenheit or Celsius.
Industry leading 25 month NIST certified product included on leaded temperature 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 Water Temperature Sensor | 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) | ||||
| Probe Temperature Range | -40°C to +100°C (-40°F to +212°F) | ||||
| Accuracy @ 25°C | +/- 1% | ||||
| User-calibrated accuracy | +/- 0.25° C (± 0.45° F) | ||||
| Time constant @ 25°C | 30 sec | ||||
| Lead wire length | 3 ft (36 in) with Water Tight Seal ** | ||||
| 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 Water Temperature Sensor | 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) | ||||
| Probe Temperature Range | -40°C to +100°C (-40°F to +212°F) | ||||
| Accuracy @ 25°C | +/- 1% | ||||
| User-calibrated accuracy | +/- 0.25° C (± 0.45° F) | ||||
| Time constant @ 25°C | 30 sec | ||||
| Lead wire length | 3 ft (36 in) with Water Tight Seal ** | ||||
| 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 Water Temperature Sensor | 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 | Minimum of 250 LUX **** | |||||
| Probe Temperature Range | -40°C to +100°C (-40°F to +212°F) | |||||
| Accuracy @ 25°C | +/- 1% | |||||
| User-calibrated accuracy | +/- 0.25° C (± 0.45° F) | |||||
| Time constant @ 25°C | 30 sec | |||||
| Lead wire length | 3 ft (36 in) with water-tight seal *** | |||||
| 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) | |||||
• Water/liquid storage tanks
• Manufacturing processes
• Swimming pools
• Aquariums
