Insertion Tensiometer for potted plants, containers, shallow beds
Insertion Tensiometerfor soil moisture measurement
Insertion Tensiometer Special Forms
Insertion
Tensiometer
for potted plants, containers, shallow beds
Suitable principally for
irrigation control by tensiostats, however, also for moisture
measurement with manometers or electronic sensors.
|
Suitable for use with following irrigation systems: |
Drip irrigation, ebb and flow, trough, or controlled flow irrigation systems; |
|
Accessories required: |
M-sensor (Model 50) or E-sensor, potentially also the Manometer 400 for models with integrated T-connection piece. |
Technical
Description
Tensiometer chamber: short or
long brown ceramic cone (type Bl), tested and calibrated, max. suction
tension > 850 hPa, reabsorption factor 0.1-0.3 (see test certificate
for the individual tensiometer).
Tube or neck pieces: Acrylic glass tube with protective covering (black
Shrink-Wrap) over entire length.
Connection: glued-on screw threaded neck piece with threading type
"GL 14" (??4 mm), generally made out of glass or PVC, also
available with T-shaped neck piece by all the "T"-models; all
threaded neck pieces fit the corresponding screw caps of the manometer
or sensors.
Viewing window: for observation of the water column located on the glass
threaded neck piece (below the screw cap), on Model LV viewing window on
tube, on Model LVT additional window on tube.
Distinguishing Characteristics
|
Model |
KV1 |
KV2 |
LV |
KVT2 |
LVT |
|
|
Article number |
1270 |
1275 |
1278 |
1280 |
1281 |
|
|
Total length |
cm |
12 |
14.5 |
22 |
16.5 |
24 |
|
Insertion depth |
cm |
5-9 |
6-12 |
8-16 |
6-12 |
8-16 |
|
Cone max. ?length |
mm |
16 |
16 |
19 |
16 |
19 |
|
Neck piece |
Glass |
Glass |
PVC |
Glass, T-form |
Glass, T-form |
|
|
Viewing window hgt. |
mm |
6 |
6 |
20 |
22 |
20 + 22 |
 |
 |
| 1201 - 1202 | 1203 - 1221 |
Suggestions,
Special Features
|
KV1 |
Best suited for small to middle size pots, not more than 150 hPa (minimal water reserve). |
|
KV2 |
Universal usage, also for somewhat drier ranges (up to 200 hPa). |
|
LV |
Preferred for use with shallowly rooting bed cultivation or larger size containers, also suited for minimal insertion depths and drier ranges. |
|
KVT2 LVT |
With integrated T-piece,
manometer and M-sensor can be attached simultaneously;
therefore, providing additional means for observing moisture
level developments and for controlling of the tensiostats.
Important to be certain by Model KVT2 when used together with
the Manometer 400 that small pots have a solid base (i.e. can
not tip over). |
Insertion
Tensiometer
for soil moisture measurement
Used primarily for moisture
measurement in soil layers of varying depths, often in conjunction with
electronic sensors as well as manometers (also see Puncture Tensiometer),
also suitable as tensiostat for soil cultures.
?Suggested insertion depth should be followed, choose fitting length!
?/i> The given depth is the approximate maximum value (middle
marking), it should be complied with as closely as possible in order to
minimize thermal influences (direct sun light) but to still be able to
observe the stand of the water column.
|
Suited for use with following irrigation systems: |
As tensiostat, used mainly for drip irrigation, for measuring purposes, no restrictions |
|
Accessories required: |
E-sensor 1000 or Manometer 400 / 1000, possibly M-sensor 100 (50). |
Technical Description
Tensiometer chamber: elongated,
brown, ceramic cone (Bl), tested and calibrated, maximum suction tension
> 850 hPa, reabsorption factor 0.1-0.3 (see test certificate for the
individual tensiometer);
alternatively available as white, kaolin chamber K100, cylindrical,
rounded bottom, especially stable, with consistent characteristics,
minimal absorption capability (material: inert Mullit).
Tube: Acrylic glass tube, ?18/12 mm, with protective covering (black
Shrink-Wrap) over the connection between the tensiometer chamber and the
threaded neck piece; every tube has marking rings for measurement of the
height of the nominal water column.
Connection: glued-on threaded neck piece with threading type "GL
14" (?14 mm), made of PVC for all models, fits with corresponding
screw cap from the manometer or sensor.
Distinguishing Characteristics
|
Model |
L2 |
L3 |
L4 |
L5 |
L6 |
L7 |
L8 |
LK2 |
|
|
Article number |
1204 |
1205 |
1206 |
1207 |
1208 |
1209 |
1210 |
1250 |
|
|
Total length |
cm |
35 |
45 |
55 |
65 |
75 |
85 |
95 |
32 |
|
Insertion depth |
cm |
25 |
35 |
45 |
55 |
65 |
75 |
85 |
21 |
|
Nominal water |
cm |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
20 |
|
Chamber: type |
|
Bl |
Bl |
Bl |
Bl |
Bl |
Bl |
Bl |
K100 |
 |
| 1204 - 1205 |
Additional
lengths
Other lengths are available in addition to the above listed models, all models can be outfitted with the kaolin chamber K100 (see LK2).
Suggestions, Special Features
|
L2 |
Typically used as tensiostat to control irrigation with drip irrigation systems for soil cultures, the insertion depth of 20 cm is also a favorable length for measuring. |
|
LK2 |
K100-chamber, best suited for scientific purposes or at sites where similar chamber types (P 80) are already in use. |
|
L2 (L3) |
Example for graduated lengths for 3 measurement horizon (measurement depths of ca. 20 ?50 ?70 cm) in order to investigate a horizontal moisture profile for a particular site; for vertical installation in ca. 10-15 cm intervals, also possible to install at an angle. These kind of moisture profiles allow for an analysis of the penetration depth of the irrigation measures taken over the course of the season (possible leaching); also see TensioSave. |
Insertion
Tensiometer
Special Forms
Technical Description
Tensiometer chamber: for model
"BIG": cylindrical, with rounded bottom, brown ceramic chamber
(type Bl), tested and calibrated, max. suction tension > 800 hPa,
reabsorption factor 0.1-0.2 (see test certificate of the individual
tensiometer); for " P-Type" models: white, kaolin rod P80,
tested , max. suction tension ?800 hPa, reabsorption factor 0.2-0.4
(depending upon size of the kaolin rod).
Tube or capillary tubing: Mini PV: kaolin rod attached directly
to an acrylic glass tube, threaded neck piece has protective covering
(black Shrink-Wrap), viewing window is located on the tube;
Jib P: Tensiometer tube made out of acrylic glass functions as
tube platform with an attachable, flat foot (available also as pin) made
of PVC; kaolin rod with attached capillary tubing (butyl rubber, ?5 mm)
functions as a jib arm and is connected on the side of the tube
platform, all connections are protected with Shrink-Wrap;
Capillary tubing PV: long, kaolin rod with attached capillary
tubing (butyl rubber, ?5 mm), tensiometer tube made of acrylic glass as
connecting piece, water reservoir at end of tubing (tensiometer tube and
tubing in line with one another), all connections protected with
Shrink-Wrap, capillary tubing protected by an additional netting,
viewing window is located on the tensiometer tube;
BIG: oversize ceramic chamber with tensiometer tube made of
acrylic glass, tube connection has special O-ring seal made of PVC with
two connecting support pieces, the connection between ceramic chamber
and tube is protected with Shrink-Wrap; (other lengths available upon
request)
Connection: glued-on threaded neck piece, threading type " GL
14" (?14 mm), made of glass or PVC, fits with the screw caps of the
corresponding manometer or sensors.
Distinguishing Characteristics
|
Model |
Mini PV |
Jib P |
Cap. Tubing PV |
BIG 2 |
BIG 3 |
|
|
Article number |
1302 |
1306 |
1307 |
1360 |
1361 |
|
|
Total length |
cm |
14 |
36 |
48 |
36 |
46 |
|
Insertion depth |
cm |
4-(8) |
3 |
7.5 |
26 |
36 |
|
Chamber: type |
|
P80 |
P80 |
P80 |
Bl |
Bl |
|
Tubing length |
cm |
- |
28 |
29 |
- |
- |
|
Supports (tube) ?br> height |
mm |
18 (16) |
18 (16) |
18 (16) |
(50) |
(50) |
|
Neck piece material |
Glass |
Glass |
Glass |
2 pieces, PVC |
2 pieces, PVC |
|
|
Viewing window hgt. |
mm |
12 |
45 |
12 |
open |
open |
 |
 |
| 1275 - 1270 - 1278 | 1280 - 1706 |
Suggestions,
Special Features
|
Mini PV |
Used for controlling irrigation or for moisture measurement in conjunction with E-sensors in small containers, such as pot trays, plug trays or compost cell packs, for instance, in cultivation of young plants (usually with ebb and flow irrigation or similar systems); important that apparatus is standing stably. |
|
Jib |
Usage as with Model Mini PV, also suitable for the smallest of containers. The tensiometer tube is placed beside the container and only the thin, jib-capillary tubing leads into the area with plants. The water turnover of the measurement site is thereby little affected. The small kaolin rod has a somewhat slower reabsorption reaction due to the smaller porous surface area, however, this is of significance only for irrigation control with direct switching. Kaolin rod and capillary tubing are filled via absorption of water through the tensio-chamber (suction flask included in delivery). |
|
Capillary tubing PV |
Used for irrigation control or moisture measurement with E-sensors in substrate balls such as compost cell packs, rock wool blocks or other similar methods for cultivating young plants, also in vegetable production. Typical set up: the long, kaolin rod is pushed shallowly into a gap between substrate blocks (can also be placed directly in or under a substrate ball). The capillary tubing with connecting supports is set along side. Two capillary tubing tensiometers can be coupled over the T-piece and an adapter (faster reaction and higher accuracy in measuring). Kaolin rod and capillary tubing are filled via absorption of water through the tensio-chamber (suction flask included in delivery). |
|
BIG |
Large volume tensiometer for moisture measurements in extensive cultures with periodic dry phases, can withstand long periods of inactivity when no irrigation is taking place due to of its large water capacity. The reaction time of the tensiometer decreases somewhat with higher suction tensions and larger air volumes (this is balanced out by the large reactive surface of the ceramic chamber. |