Ecomatik DF2 Manuel utilisateur
Dendrometer
Muenchner Str. 23
D-85221 Dachau/Germany
Tel.: +49 8131 260 738
Fax: +49 8131 260 736
website: www.ecomatik.de
Fruit Dendrometer (Type DF2)
For measuring changes in diameter of fruits and vegetables
User Manual
Version 2.0
Fruit Dendrometer –Type DF2
1
1. Introduction
Thank you for purchasing an Ecomatik Dendrometer type DF2. This is a highly precise sensor
for continuous measurements of diameter changes of fruits and vegetables under both indoor
and outdoor conditions.
This manual is written to help you install and operate your DF2 dendrometer with least difficul-
ty and for desirable results. Please read it carefully before installing the sensor, and refer to it if
you should have any difficulty with the sensor in the future.
The dendrometer is the sensor part of a measuring system. This means that the dendrometer
must be connected to a data logger for continuous data recording. The dendrometer is com-
patible with the most data logger types. At Ecomatik a low-cost, special for dendrometers de-
veloped DL18 logger is available.
2. Product Description
The picture below shows the contents of delivery. Please contact us should you miss anything
of these items.
Fruit Dendrometer
The standard cable length is 5 m. if you ordered cable extension, the cable length is the or-
dered extension + 5 m.
To meet the requirements of different loggers, there are 2 different types of cables: cable with
plug and cable without plug. Cable with plug can only be connected to Dendrometer Logger
DL18. Cable without plug can be connected to other loggers.
3. Safety Information
The sensor is protected from rain water, but it is not waterproof. Please do not immerse the
sensor in water, or install the sensor below a longer lasting snow cover.
Fruit Dendrometer –Type DF2
2
Avoid any tension between the cable and sensor during handling and operation.
Pay attention to connections to data logger. Wrong connections will provide wrong readings.
4. Installation
Tools: Cable strap, spanner (M3), screw driver, and rope.
Depending on the type of fruits, there are 3 kinds of installation: small fruits, big fruits and
elongated fruits. The photos below show how the fruits are fastened to the dendrometer.
Generally, it must be ensured:
Tighten all screws firmly and the frame is stable.
The dendrometer bears the weight of fruit.
The cable does not pull on the sensor.
No rain water flows into the sensor.
The sensor rod is slightly pushed in by 2-3 mm.
5. Wiring and Logger Configuration
The dendrometer is compatible with most data loggers. In the following we describe the con-
nection with Dendrometer Logger (DL18), Campbell Logger (CR1000). Please contact us if
your logger is not described here.
Dendrometer Data Logger (DL18)
The DL18 is a battery powered, waterproof logger for connecting 4 dendrometers. It is a very
effective data logger for dendrometer measurement under outdoor conditions. For details
please see the user manual of the DL18.
Campbell Data Logger (CR1000)
The dendrometer can be measured both in single-ended voltage as well as differential voltage
mode. Differential voltage mode provides better accuracy. But single-ended mode requires half
as many channels as differential mode. One CR1000 can include 16 dendrometers in single-
ended mode, but only 8 dendrometers in differential mode.
Fruit Dendrometer –Type DF2
3
Single-ended Voltage Mode ( 2 dendrometers)
Connection
Cable Color
Input Port
1st dendrometer
Yellow
1H
Green
Ground
Brown
Vx1
White
Ground
2nd dendrometer
Yellow
1L
Green
Ground
Brown
Vx1
White
Ground
Program Syntax
ExciteV (Vx1,2500,0)
VoltSe(SEVolt(),2,mV2500,1,True,0,_50Hz,Mult(),Offs())
If Multiplier=10.16, Offset=0, the results are measured in microns.
Differential Voltage Mode ( 2 dendrometers)
Connection
Cable Color
Input Port
1st dendrometer
Yellow
1H
Green
1L
Brown
Vx1
White
Ground
2nd dendrometer
Yellow
2H
Green
2L
Brown
Vx1
White
Ground
Program Syntax
ExciteV (Vx1,2500,0)
VoltDiff(DiffVolt(),2,mV2500,1,True,0,_50Hz,Mult(),Offs())
If Multiplier=10.16, Offset=0, the results are measured in microns.
An interval 0.5-hour for data collection can reveal the diurnal course of diameter changes very
well.
5. Adjustment and maintenance
Fruits usually grow very fast, the diameter can grow to 0.5 mm per day. It is therefore very im-
portant to pay attention to the reset of the sensor. When the output approaches 25 mm, the
sensor needs to be reset. Relax the screws and let the sensor again at the position where the
sensor is pushed in about 2-3 mm.
6. An Example of measured data
The figure shows the diameter changes of a apple measured with an Ecomatik fruit dendrome-
ter.
Fruit Dendrometer –Type DF2
4
29 30 31 12345678910 11 12
Time of Day
32000
33000
34000
35000
36000
37000
38000
Apple Diameter (µm)
Aug
7. Technical Specification
Type:
Fruit dendrometer DF2
Use area:
For measuring diameter changes of small/medium sized, fast-
growing fruits
Diameter of fruit:
0-11 cm (>11 cm on request)
Range of the senor:
25.4 mm
Resolution:
The resolution of the sensor itself is infinite. The resolution of read-
ings is determined by connected data logger, e.g.
CR1000: 3.3 µm
Dendrometer logger DL18: 0.5 µm
Accuracy:
Dendrometer dependent:
Max. ±1.97% of reading (stable offset)
Dependent on the connected data logger, e.g.:
CR1000:±(0.04% of reading+10µm)
Dendrometer logger DL18: ±0.1%
Temperature coefficient
of the sensor:
<0.2 µm / °C in the whole range
Linearity:
<0.7%
Environment:
Outdoor condition: -25 to 70C air temperature,
0 to 100% relative air humidity
Weight of the sensor:
26 g without cable
Power supply:
Stabilized Vex of 0.5 –10 VDC, power consumption practically zero
Material:
Stainless steel and Aluminum
Cable length:
5 m, extendable up to 100 m
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