HYPROP manual - UMS

More documents

Recommendations

Info

Product description Sampling ring Silicone gasket Tensiometer shaft for lower level incl. ceramic tip O-Ring, prevents intrusion of soil Tensiometer shaft for upper level incl. ceramic tip O-Ring, seals Tensiometers Screw-in thread for the shafts with pressure transducer beneath Fastener clip Temperature sensor Sensor unit Fig. Figure 3: Sensor 3-2 unit 3.2.2 Pressure transducers The internal pressure transducers measure the soil water tension in the sample through the two shafts differentially against atmosphere. 14/104
Product description 3.2.3 Tensiometers Tensiometers measure the soil water tension or the matric potential. These Tensiometers have a measuring range of +100 kPa (water pressure) to -85 kPa (water tension). With proper filling the Tensiometers may work beyond the conventional tension measuring range. If the soil gets too dry the Tensiometer needs to be refilled (see chapter “Refilling”). The soil water tension is conducted via the porous ceramic tip to the water inside the shaft and measured as an analogue signal by the pressure transducer. The Tensiometer shafts are screwed into the transducer openings in the sensor unit. Standard sampling rings can Fig 3-3 easily be placed on the sensor unit so the Tensiometer ceramic tips are positioned inside the soil sample. There is one short and one long shaft to pick up the tension at two depths. The Tensiometer shafts are one of the most sensitive parts of the system. Always handle them with care. To transfer the soil water tension as a negative pressure into the Tensiometer, a semi-permeable diaphragm is required. This must have good mechanical stability and water-permeability, but also have gas impermeability. The Tensiometer tip consists of porous ceramic Al 2 O 3 sintered material. The special manufacturing process guarantees homogeneous porosity with good water conductivity and very high firmness. Compared to conventional porous ceramics the tip is much more durable. The bubble point of a Tensiometer ceramic is about 800 kPa. If the soil gets dryer than the bubble point, air passes through. Thus, the negative pressure inside the cup decreases and the readings go down to 0 kPa. With these characteristics this material has outstanding suitability to work as the semi permeable diaphragm for Tensiometers. Be aware that the ceramic will dry out when it is exposed to air uncovered. Always put on the rubber cap filled with some water. 15/104
Page 1 and 2: User Manual HYPROP
Page 3 and 4: HYPROP system 5.2.5 Stored readings
Page 5 and 6: HYPROP system 1 HYPROP system Labor
Page 7 and 8: HYPROP system Bag 2 (white lock): s
Page 9 and 10: HYPROP system 2. Peters, A., and W.
Page 11 and 12: HYPROP system 1.6 Important note Th
Page 13: Product description 3 Product descr
Page 17 and 18: With tensioLINK ® you are able to
Page 19 and 20: Get ready to start a measuring camp
Page 35 and 36: Set-up the HYPROP 5 Set-up the HYPR
Page 37 and 38: Set-up the HYPROP In the single dev
Page 39 and 40: Set-up the HYPROP Please note the f
Page 41 and 42: Set-up the HYPROP 5.2 Software tens
Page 43 and 44: Set-up the HYPROP Depending on the
Page 45 and 46: Set-up the HYPROP Soil volume Volum
Page 47 and 48: Set-up the HYPROP 5.2.4 Current rea
Page 49 and 50: Set-up the HYPROP Select the scale
Page 51 and 52: Perform a measuring campaign 3. The
Page 53 and 54: Perform a measuring campaign 6.3 Co
Page 55 and 56: Perform a measuring campaign 6.4.4
Page 57 and 58: Perform a measuring campaign Figure
Page 59 and 60: Perform a measuring campaign 6.5 De
Page 61 and 62: Perform a measuring campaign If the
Page 63 and 64: Perform a measuring campaign 3. Ple
Page 65 and 66:
Perform a measuring campaign 6.8 Dr
Page 67 and 68:
Trouble shooting 8 Trouble shooting
Page 69 and 70:
Service and maintenance 9 Service a
Page 71 and 72:
Service and maintenance 9.4 Change
Page 73 and 74:
Theoretical basics 10 Theoretical b
Page 75 and 76:
Theoretical basics 10.3.1 The van G
Page 77 and 78:
Additional notes 11 Additional note
Page 79 and 80:
Additional notes 11.2 Vapour pressu
Page 81 and 82:
Appendix Description of the measuri
Page 83 and 84:
Appendix 12.1.2 Clayey silt (Ut3) S
Page 85 and 86:
Appendix 12.1.3 Slightly loamy Sand
Page 87 and 88:
Appendix Evaluation The additional
Page 89 and 90:
Appendix • After draining the mai
Page 91 and 92:
Appendix 12.3 Parameter list 12.3.1
Page 93 and 94:
Appendix 12.3.3 Parameter listing a
Page 95 and 96:
Appendix 12.5 Technical specificati
Page 97 and 98:
Appendix 12.6 Accessories 12.6.1 HY
Page 99 and 100:
13 List of literature • Brooks, R
Page 101 and 102:
List of literature • Schindler, U
Page 103 and 104:
Index M matric potential ..........
Page 106:
© 2012 UMS GmbH, Munich, Germany P
show all

HYPROP manual - UMS

Create successful ePaper yourself

Delete template?

Save as template?