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OPERATING
INSTRUCTIONS
Model 2900F1 "QUICK DRAW" SOILMOISTURE PROBE
May 2012
Figure 1 - 2900F1 Soilmoisture "Quick Draw" Probe
The 2900F1 QuickDraw Soilmoisture Probe is the most effective portable moisture measuring instrument
available. Designed for rugged field use, the thermos construction utilizing capillary tube connections and super
porous ceramic tip assures fast response and accurate readings, independent of temperature differences. The self-
servicing feature, unique in tensiometer construction, eliminates the need for accessory service kits, and assures fast
response times after years of use.
The Probe is shipped in a dry condition for greater convenience in handling and storage over a period of time. Fol-
low the simple instructions to water fill your unit in preparation for use.
SOILMOISTURE EQUIPMENT CORP.
P.O. Box 30025, Santa Barbara, CA 93105 U.S.A.
SOILMOISTURE
Telephone 805-964-3525 - Fax No. 805-683-2189
www.soilmoisture.com - sales@soilmoisture.com
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Summary of Contents for Soilmoisture Equipment 2900F1
- Page 1 May 2012 Figure 1 - 2900F1 Soilmoisture "Quick Draw" Probe The 2900F1 QuickDraw Soilmoisture Probe is the most effective portable moisture measuring instrument available. Designed for rugged field use, the thermos construction utilizing capillary tube connections and super porous ceramic tip assures fast response and accurate readings, independent of temperature differences. The self- servicing feature, unique in tensiometer construction, eliminates the need for accessory service kits, and assures fast response times after years of use.
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Page 2: Table Of Contents
Time Required to make a Reading ......................... Page 22 Care and Maintenance ............................Page 23 Tips for Scheduling Irrigations ..........................Page 24 Parts List ..............................Page 26 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189 www.soilmoisture.com - sales@soilmoisture.com... -
Page 3: Unpacking
UNPACKING Not Liable for improper use. Remove all packing materials and check the 2900F1 Soilmois- ture "Quick Draw" Probe for any damage that may have occurred during shipment. If the Sampler is damaged, call the carrier immediately to report it. Keep the shipping container and all evidence to support your claim. -
Page 4: Aquaint Yourself With The Parts
Sensing Tip. The Allen Wrench is used in the event the Vacuum Dial Gauge needs replacement. Figure 3 - Probe Case Tool Placement SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. -
Page 5: Theory Of Operation
Under these conditions, air can diffuse through the water in the pores of the Sensing Tip and enter the Probe, which can result in a decrease in sensitivity and require a refilling cycle. SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. -
Page 6: Venting And Adjusting Dial Gauge
SOILMOISTURE IN THIS RANGE AIR COMING OUT OF SOLUTION MAKES READING INACCURATE CENTIBARS OF SOIL SUCTION THEORETICAL LIMIT SOILMOISTURE EQUIPMENT CORP Santa Barbara, CA USA OF READING AT 1000 FT. ABOVE SEA LEVEL PRACTICAL READING RANGE 0 TO 81 CENTIBARS... -
Page 7: Initial Filling
Keep the sensing tip in water. Continue to turn the Null Knob slowly counterclockwise until it is loose and can be removed. Figure 8 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189... - Page 8 Figure 10 STEP 6 Turn the Null Knob clockwise as far as it will go. Figure 11 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189 www.soilmoisture.com - sales@soilmoisture.com...
- Page 9 STEP 9 Immerse the porous sensing tip again in water and wait until the pointer drops to zero. Figure 14 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189 www.soilmoisture.com - sales@soilmoisture.com...
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Page 10: Response Time Too Long
Probe is held vertically and only when the ceramic sensing tip is immersed in water. For pointer setting instructions, refer to page 6, "Venting and Adjusting the Dial Gauge". SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. -
Page 11: Making A Soil Moisture Measurement
When taking measurements in these loose soils make sure the porous ceramic sensing tip is in good contact with the soil and the Probe is inserted without using undue force. SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. -
Page 12: Inserting The Probe
“TAPERED” PORTION OF OF HOLE PROVIDES HOLE ASSURES TIGHT CLEARANCE FOR PROBE FIT BETWEEN SENSING TIP AND SOIL Figure 19 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189 www.soilmoisture.com - sales@soilmoisture.com... -
Page 13: Making A Reading
10 centibars higher and observe the pointer movement. If it contin- ues to move up to a higher value, advance the pointer an additional 10 centibars. Once you reach a level where the SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. -
Page 14: Dial Gauge Pressure Build-Up
To detect such a condition, observe the dial pointer when pushing the Probe down into the soil. If the pointer moves below the zero mark and touches the pin, pressure is SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. -
Page 15: Irrigation Scheduling
CENTIBARS OF SOIL CENTIBARS OF SOIL SUCTION Zero readings can be expected after a SUCTION SOILMOISTURE EQUIPMENT CORP SOILMOISTURE EQUIPMENT CORP MEDIUM TEXTURED SOILS: No Santa Barbara, CA USA Santa Barbara, CA USA heavy rain or deep irrigation. If the zero irrigation required. -
Page 16: Routine Measurements
After completing his other work, he would return to pick up the Soilmoisture Probes. By this time, the Probes would have reached equilibrium, and the readings would be quickly noted. SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. -
Page 17: Troubleshooting
Null Knob, there is too much air in the system, and there may also be a crack in the sensing tip. To replace the porous ceramic sensing tip, see the section on this. SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. -
Page 18: Replacing The Ceramic Tip
The O-ring seals, porous ceramic sensing tip and slotted cap nut are arranged (see Fig. 23) in the same manner as they fit on to the stem of the Probe. (Continued on next page) SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. - Page 19 After replacing the tip, fill the Probe as described in “Initial Filling” (see page 7). Figure 26 Figure 27 Figure 29 Figure 28 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189 www.soilmoisture.com - sales@soilmoisture.com...
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Page 20: Replacing The Dial Gauge
The internal connecting tube usually remains in the dial gauge. Carefully pull out the internal connecting tube from the dial gauge. Figure 32 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189... - Page 21 However, it will require a number of Probe filling cycles to remove all the air from the gauge before the desired response time is obtained. Figure 34 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189...
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Page 22: Time Required To Make A Reading
Probe to adjustments of the Null Knob when making a reading. MINUTES Figure 35 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189 www.soilmoisture.com - sales@soilmoisture.com... -
Page 23: Care And Maintenance
4. Replace the QuickDraw with the ceramic tip wrapped in plastic wrap into the carrying case. 5. Place the unit in a non-freezing location. 6. Next Spring, un-wrap the unit and re-wet the sponge. The unit should be in top working order. SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. -
Page 24: Tips For Scheduling Irrigations
“knee-of-the-moisture/tension-curve” where water at lower tensions impart no stress, while at greater tensions the crop experiences mild and then moderate to severe water stress. Use the following guide to help your irrigation management decisions. SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. - Page 25 Copyright © 2002 Soilmoisture Equipment Corp. Figure 36 All rights reserved. SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189 www.soilmoisture.com - sales@soilmoisture.com...
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Page 26: Parts List
Quick Draw Probe Coring Tool, 36 inch size Z2953F Quick Draw Probe Cleaning Rod 2900FK2 Pack of all O-Rings required for the 2900F1 Probe (not shown) SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189... - Page 27 REPLACEMENT PARTS (cont.) SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189 www.soilmoisture.com - sales@soilmoisture.com...
- Page 28 With dealers throughout the world, you have convenience of purchase and assurance of after-sales service. © COPYRIGHT 2012 ALL RIGHTS RESERVED 0898-2900F1.051512 SOILMOISTURE EQUIPMENT CORP. P.O. Box 30025, Santa Barbara, CA 93105 U.S.A. SOILMOISTURE Telephone 805-964-3525 - Fax No. 805-683-2189 www.soilmoisture.com - sales@soilmoisture.com...
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