Discrete ConfigurationThe battery life calculations, in years, for some discrete sensors are shown in the table below.Table 2: Battery Life in YearsManufacturer Device Model Boost Voltage Warmup Time1 Banner Optical SM312DQD-78419 5V 4 ms2 Turck Inductive Proximity Bi10U-M30-AP6X-H1141 10V 10 msBattery Life in YearsSample and Report Rates62.5 ms 125 ms 250 ms 500 ms 1 second 2 seconds 16 seconds1 0.97 1.67 2.62 3.74 4.75 5.49 6.282 0.20 0.40 0.72 1.27 2.05 2.99 5.07Note, battery life calculations are based on the sensor operating 24 hours a day, 365 days a year.SM312DQD-78419Bi10U-M30-AP6X-H11410123456762.5 ms 125 ms 250 ms 500 ms 1 sec 2 sec 16 secDX81 Battery Life (Years)Sample and Report RatesFor each sensor characterized, a boost voltage and warmup time was specified. The sample and reports rates were varied to calculatethe estimated battery life. For example, a Banner Optical sensor, model SM312DQD-78419, set to a boost voltage of 5 volts, a warm-uptime of 4 milliseconds, and a sample and report rate of 16 seconds, should have a battery life of just over 6 years.The curves for discrete devices represent a “worst case” as far as battery use because we are assuming for each sample of the sensor’soutput a change in state has occurred (e.g., target present to target absent or vice versa), sending a radio message from Node to Gate-way. No messaging occurs unless there is a change to report. Actual battery life depends on how many state changes actually occur.All battery life calculations are approximations based on a strong radio signal. Weaker radio connections and missed packets will de-crease the battery life.SureCross Wireless I/O Network Manual76 www.bannerengineering.com - tel: 763-544-3164 rev. I
