The DEX20, DEX70, DEX100 and DEX200 are highly precise electronic dendrometers that measure the growth and size of plant stems and fruits. The effects of environmental factors on the water balance of plants and stem size variations over time are easily monitored with a temperature compensated dendrometer. The DEX is a caliper-style device with a full bridge strain gage attached to a flexible arm. The output signal is then recorded by a data logger or computer in real time. The millivolt sensor output shows both the diurnal and long term growth of the plant. The device has been used to test plants under conditions of water stress, elevated ozone and other atmospheric pollutants. Applications for screening plants for growth rate and stress tolerance are also common.
Features
- Non-destructive
- Real-time measurements
- Adaptable to computer systems
- Long-term measurements possible
- Weatherproof and rugged for field study
- Caliper body - milled alloy
- Stainless steel flex band
- Four balanced, temperature compensated strain gages
- Electronics sealed and weatherproofed
- (5) clamping blocks provided, 3 for stems and 2 for fruits
- Wires directly to datalogger
Downloads
| Units | DEX20 | DEX70 | DEX100 | DEX200 |
| Measurement Range | 5 - 25 mm | 10 - 70 mm | 25 - 100 mm | 95 - 200 mm |
| Expansion Range | 0 - 5 | 0 - 13 | 0 - 13 | 0 - 13 |
|
Demensions Length Width Height |
65 19 38 |
102 25.4 51 |
155 25.4 76 |
263 38 153 |
| Weight | 55 g | 180 g | 230 g | 572 g |
|
Standard Clamping Blocks Dimensions Set 1 Face Radius Dimensions Set 2 Face Radius |
19 x 19 x 6 5mm 19 x 19 x 6 25 mm |
25 x 25 x 9.5 70 mm 25 x 25 x 13 5 mm / 50 |
25 x 25 x 9.5 108 mm 25 x 25 x 13 25 mm / 75 |
25 x 25 x 905 200 mm
|
|
Optional Clamping Blocks Dimensions Spherical Radius |
19 x 19 x 6 25 mm |
25 x 25 x 9.5 70 mm |
25 x 25 x 13 105 mm |
38 x 38 x 7 500 mm |
| Units | DEX20 | DEX70 | DEX100 | DEX200 |
| Operating Range | -10 to 50ºC | -10 to 50º C | -10 to 50º C | -10 to 50º C |
| Temperature Stability |
0.0025 mm / º C | 0.0025 mm / º C | 0.0025 mm / º C | 0.0025 mm / º C |
| Accuracy Over 20º C Range |
0.050 mm | 0.050 mm | 0.050 mm | 0.050 mm |
| Units | DEX20 | DEX70 | DEX100 | DEX200 |
| Signal Output Range | ±5 mV | ±5 mV | ±2.5 mV | ±2.5 mV |
| Output Sensitivity | .5 mV/mm | .22 mV/mm | .13 mV/mm | .05 mV/mm |
| Conversion Mult | 2.0 mm/mV | 4.5 mm/mV | 7.7 mm/mV | 20 mm/mV |
| Output LInearity | ±01 mV/mm | ±006 mV/mm | ±004 mV/mm | ±004 mV/mm |
| Electrical Noise Limit | ±0.01 mV | ±0.01 mV | ±0.01 mV | ±0.01 mV |