DAVIS Leaf Wetness Sensor Installation Manual
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DAVIS Leaf Wetness Sensor, Product # 7846 & 7848 L EAF W ETNESS S ENSOR S TANDARD & I NDUSTRIAL I NSTALLATION M ANUAL The leaf wetness sensor enables the GroWeather™ to detect the presence of surface moisture on foliage and calculate the duration of wetness. When mois- ture is present, the sensor detects an electrical resistance change between the gold-plated elements of the grid. This is displayed by the GroWeather console as a value between 0 (dry) and 15 (wet). Using the GroWeatherLink ® software, you may select your own wetness threshold; the software will then calculate leaf-wet hours. C OMPONENTS The leaf wetness senso
DAVIS Leaf Wetness Sensor, Page 2 Leaf Wetness Sensor T OOLS AND M ATERIALS N EEDED You may need some of the following tools and materials in order to complete your installation. Please be sure you have everything you need before begin- ning. ✦ Medium Phillips Screwdriver ✦ Wrench ✦ Drill with 7/32" (5.5 mm) Drill Bit To drill holes in the Sensor Mounting Arm (SMA) if installing on an older version of the SMA. ✦ 7/16" Wrench or Adjustable Wrench To tighten hex nuts if installing on a pipe. T ESTING TH
Installing the Sensor Page 3 I NSTALLING THE S ENSOR Follow the instructions in this section to install your sensor. Before you begin, consult the System Installation manual for instructions on labeling the leaf wet- ness sensor cable. Typical Standard Installation The illustration below shows typical standard leaf wetness installation. The sensor cable attaches to co
DAVIS Leaf Wetness Sensor, Page 4 Leaf Wetness Sensor Typical Industrial Installation The illustration below shows typical industrial leaf wetness installation. The sensor cable attaches to connector S3 on the sensor interface module (SIM). T YPICAL I NDUSTRIAL I NSTALLATION
DAVIS Leaf Wetness Sensor, Installing the Sensor Page 5 Mounting the Sensor on the Sensor Mounting Arm Follow the instructions below to mount the sensor on the Sensor Mounting Arm (SMA). 1. If no holes exist on the side of the mounting arm, you need to mark the location of the two holes on the mounting bracket and drill holes through the SMA in these locations using a 7/32" (5.5 mm) drill bit. If you are not using the Sensor Tilting Bracket, you may use one of the holes designated for the bracket for the leaf wetness sensor. Early versions of the SMA di
DAVIS Leaf Wetness Sensor, Page 6 Leaf Wetness Sensor Mounting the Sensor Against a Wooden Surface To mount the sensor against a wooden surface, secure the sensor to the surface using the #8 wood screws as shown below. M OUNTING ON A W OODEN S URFACE Mounting the Sensor on a Pipe To mount the sensor on a pipe, stake, or pole with outside diameter between 1" and 1-1/4" (25 mm and 31 mm), secure the sensor to the pipe using the 1-1/ 2" U-bolts, 1/4" flat washers, and 1/4" hex nuts as shown below. Use a 7/16" wrench or adjustable wrench to tighten the hex nuts. M OUNTING ON A P IPE
DAVIS Leaf Wetness Sensor, Technical Support Page 7 T ECHNICAL S UPPORT Before calling Technical Support (1-510-732-7814), carefully check all cable con- nections from the sensor to the console. Cable connections account for a large portion of the potential problems. Connections should be firmly seated in the jacks and plugged in straight. If you think a connection may be faulty, try jig- gling the cable while looking at the display. If a reading appears intermittently on the display as you jiggle the cable,
Product Numbers: 7846 & 7848 Davis Instruments Part Number: 7395-110 Leaf Wetness Sensor, Standard and Industrial Rev. D Manual (7/7/99) This product complies with the essential protection requirements of the EC EMC Directive 89/336/EC. © Davis Instruments Corp. 1996. All rights reserved.
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