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DS1923-F5 Datasheet(PDF) 4 Page - Dallas Semiconductor |
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DS1923-F5 Datasheet(HTML) 4 Page - Dallas Semiconductor |
4 / 53 page DS1923: Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory 4 of 53 Note 17: For software corrected accuracy, assume correction using calibration coefficients with calibration equations for error compensation. Note 18: Software correction for humidity and temperature is handled automatically using the 1-Wire Viewer Software package available at: http://www.ibutton.com. Note 19: WARNING: Not for use as the sole method of measuring or tracking temperature and/or humidity in products and articles that could affect the health or safety of persons, plants, animals, or other living organisms, including but not limited to foods, beverages, pharmaceuticals, medications, blood and blood products, organs, flammable, and combustible products. User shall assure that redundant (or other primary) methods of testing and determining the handling methods, quality, and fitness of the articles and products should be implemented. Temperature and/or humidity tracking with this product, where the health or safety of the aforementioned persons or things could be adversely affected, is only recommended when supplemental or redundant information sources are used. Data logger products are 100% tested and calibrated at time of manufacture by Dallas Semiconductor/Maxim to ensure that they meet all data sheet parameters, including temperature accuracy. User shall be responsible for proper use and storage of this product. As with any sensor-based product, user shall also be responsible for occasionally rechecking the temperature accuracy of the product to ensure it is still operating properly. Note 20: Response time is determined by measuring the 1/e point as the device transitions from 40 to 90%RH or 90 to 40%RH, whichever is slower. Test was performed at 5L/min airflow. Note 21: All DS1923 humidity measurements are 12-bit readings. Missioning determines 8-bit or 16-bit data logging. Battery lifetime is the same no matter what RH resolution is logged. Note 22: Reliability studies have shown that the device survives a minimum of 1000 cycles of condensation and drying, but this product is not guaranteed for extended use in condensing environments. Note 23: Software corrected accuracy is accomplished using the method detailed in the Software Correction Algorithm for Temperature section of this data sheet. Note 24: Every DS1923 Device is measured and calibrated in a controlled, NIST-traceable RH environment. Note 25: Higher accuracy versions may be available. Contact the factory for details. Note 26: If this device is exposed to a high humidity environment (>70%RH), and then exposed to a lower RH environment, the device will read high for a period of time. The device will typically read within +0.5%RH at 20%RH, 30 minutes after being exposed to continuous 80%RH for 30 minutes. Note 27: All capacitive RH sensors can change their reading depending upon how long they have spent at high (>70%RH) or low RH (<20%RH). This effect is called saturation drift and can be compensated through software, as described in the Software Saturation Drift Compensation section of this data sheet. Note 28: Individual RH readings always include a noise component (repeatability). To minimize measurement error, average as many samples as is reasonable. Note 29: Like all relative humidity sensors, when exposed to contaminants and/or conditions toward the limits of the safe operating range, accuracy degradation can result (see Safe Operating Range chart). For maximum long-term stability, the sensor should not be exposed or subjected to organic solvents, corrosive agents (strong acids, SO2, H2SO4, CI2 ,HCL, H2S, etc.) and strong bases (compounds with PH greater than 7). Dust settling on the filter surface does not affect the sensor performance except to possibly decrease the speed of response. For more information on the RH sensor’s tolerance to chemicals visit: http://content.honeywell.com/sensing/prodinfo/humiditymoisture/technical/c15_144.pdf Note 30: All humidity specifications are determined at +25°C except where specifically indicated. Standard Values DS1923 Values Parameter Standard Speed Overdrive Speed Standard Speed Overdrive Speed Name Min Max Min Max Min Max Min Max tSLOT (incl. tREC) 61µs (undef.) 7µs (undef.) 65µs 1) (undef.) 9.5µs (undef.) tRSTL 480µs (undef.) 48µs 80µs 690µs 720µs 70µs 80µs tPDH 15µs 60µs 2µs 6µs 15µs 63.5µs 2µs 7µs tPDL 60µs 240µs 8µs 24µs 60µs 287µs 7µs 28µs tW0L 60µs 120µs 6µs 16µs 60µs 120µs 7.5µs 12µs 1) Intentional change, longer recovery time requirement due to modified 1-Wire front end. PHYSICAL SPECIFICATION Size See mechanical drawing Weight Ca. 5.0 grams Safety Meets UL#913 (4 th Edit.); Intrinsically Safe Apparatus, approval under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations |
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