Frequently Asked Questions
- ATMOS 14 - SRS - IRT - ECT - PAR - PYR - ATMOS 22 - ATMOS 41 - PHYTOS 31 - ECRN-100 - ECRN-50 How do I assemble the anemometer mast?
The anemometer mast is suitable to mount METER’s above-ground sensors: ATMOS 41, ATMOS 22, ATMOS 14, PAR, PYR, IRT, SRS, PHYTOS 31, ECRN-100, ECRN-50, and ECT. Additional brackets may be required for some products.
Anemometer mast kit: 1 extendable mast (fiberglass), 1 guy ring, 1 guy rope (7.6 m nylon rope), 3 guy rope anchors, and 1 mast base with center peg and set screw.
Mast diameter: 4.5 cm
Mast adjustable length: 1.3 to 2.3 m
Tools to bring to the field: measuring tape, long metal screwdriver, mallet, wrench, level, scissors, optional shovel, and lighter.
Installation: Position the mast base in the desired installation location, avoiding large rocks. Install the center peg using a mallet. Insert the mast into the base so that the center peg is inside the mast tube. With the mast in the base, turn the set screw so it is hand-tight against the mast. Then, gently turn the set screw with a wrench. Do not over tighten or the fiberglass pole will break. Put the guy ring over the extendable mast. Cut the guy rope into thirds (approximately 2.5 m each) and burn the ends with a lighter to prevent fraying. Position the rope anchors equidistant apart to be about 1 meter away from the mast. Screw the anchors into the soil at the same angle as the guy rope using a long metal screwdriver as a make-shift turning handle. Attach the guy rope to the guy ring in 3 equidistant holes (show below) using knots. Then knot each guy rope in the corresponding anchor. Pull the rope very tight and ensure the mast is level and straight.
Once the mast is secure, move the adjustable lever up to release the extendable mast. Move the lever down to secure the mast to the correct height. Install instruments following the sensor quick start guides and manuals.
Limitations: Rocky soils, long-term monitoring sites, locations with high animal traffic. The SRS extension arm may be too heavy for the fiberglass mast.
- PHYTOS 31 How often should I recondition the surface of the PHYTOS 31 leaf wetness sensor to prevent UV damage?
METER recommends applying McNett UV Tech to the PHYTOS 31 sensor every 45 days. McNett UV Tech is sold separately and is the only 3rd party tested and approved UV blocking system for the PHYTOS 31.
- PHYTOS 31 Can I measure the presence of rain, fog and dew with the PHYTOS 31 leaf wetness sensor? Yes, depending on the situation, you can use the PHYTOS 31 as a rain detector using the following methods:Other methods to measure/detect fog and dew with the PHYTOS 31 are described here:
- PHYTOS 31 What is the accuracy or tolerance of the PHYTOS 31 (LWS)?
We set each PHYTOS 31 (LWS) to read very close to identically when dry. Our specification is 318-321 mV at 3000 mV excitation. The sensor does not have a voltage regulator, so larger differences could be caused from an unstable excitation voltage. Because the sensor is not regulated, the output will be somewhat proportional to the excitation (2.5 to 5.0 V).