- PTM-48A Photosynthesis Monitor
- PM-11 Phytomonitor
- Sensors for PTM-48A and PM-11
- Overview
- Plant Sensors
- Environmental Sensors
- Sensors for third party loggers
- Overview
- Plant Sensors
- Environmental Sensors
SF-4M SF-5M Sap Flow sensors
Overview
The SF-4M and SF-5M sensors are designed for monitoring relative variations of sap flow rate in a leaf petiole or small shoot.
The sensor’s probe is made as a hollow collapsible heat-insulating cylinder. A heater and a pair of bead thermistors are located inside the cylinder.
A signal conditioner provides powering of the heater and conditioning of the output signal.
The probe is connected by a standard 1-meter cable to the waterproof box with the signal conditioner inside.
The output cable length should be specified in the order if required.
Specifications
| SF-4M | SF-5M | |
| Measurement range | Not specified1 | |
| Output | ||
| SF-4/5M | 0 to 2 VDC, linear | |
| SF-4/5Mi | 4 to 20 mA | |
| Supply voltage | 10 to 30 VDC @ 400 mW max | |
| Accuracy | Not specified | |
| Heating power (typical) | 30 mW | |
| Suitable stem diameter, mm | 1 to 5 | 4 to 10 |
| Warm up time | 5 min | |
| Overall dimensions of the sensor, mm | 30 × 30 × 40 | 30 × 35 × 40 |
| Cable length between probe and signal conditioner | 1 m | |
- Approximate range of 12 ml/h was determined on a stem simulator – a fiber-filled PVC hose with 5 mm in diameter.