External Event Input Event sensor: Two-wire interface suitable for measuring mechanical and electrical contact closures Maximum input frequency: 1 Hz (1 pulse per second) Lockout time: 500 ms Minimum pulse width: 1 ms (hardware debounce) Input/output impedance: 100 kΩ Edge detection: Falling edge, contact closure, or Schmitt-trigger buffer Preferred switch type: Normally open. For maximum battery life, the event input should be used with its preferred switch type. The logger will work with normally closed switches, but battery life will be compromised. Open circuit input voltage: Battery voltage; nominally 3.0 V Maximum input voltage: Battery voltage + 0.3 V User connection: 24 AWG, 2 leads: white (+), black (-)Image

 Temperature Measurement Measurement range: -20° to 70°C (-4° to 158°F) Accuracy: ± 0.53°C from 0° to 50°C (± 0.95°F from 32° to 122°F), see Plot A. A solar radiation shield is required for accurate temperature measurements in sunlight. Resolution: 0.14°C at 25°C (0.25°F at 77°F), see Plot A Drift: Less than 0.1°C/year (0.2°F/year) Response time: Airflow of 2 m/s (4.4 mph): 10 minutes, typical to 90%Logger Image

Time accuracy: ± 1 minute per month at 25°C (77°F), see Plot B Operating range: -20° to 70°C (-4° to 158°F) Environmental rating: Tested to NEMA 6 and IP67; suitable for deployment outdoors Drop specification: 1.5 m (5 ft) onto concrete NIST traceable certification: Available for temperature only at additional charge; temperature range -20° to 70°C (-4° to 158°F) Battery: CR-2032 3V lithium battery; 1 year typical use Memory: 64K bytes Materials: Polypropylene case; stainless steel screws; Buna-N o-ring; PVC cable insulation Weight: 50 g (1.7 oz.) Dimensions: 71 x 33 x 23 mm (2.8 x 1.3 x 0.9 inches); 1.8 m (6 ft) cableThe CE Marking identifies this product as complying with the relevant directives in the European Union (EU).