Stem Flow Meter
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| Brand | Dynamax |
|---|---|
| Origin | USA |
| Model | SGDC |
| Type | Heat Balance-Based Stem Flow Sensor |
| Compliance | Validated per USDA-ARS protocols (Lascano et al., 2016, *Agric. Sci.*) |
| Channel Requirement | 2 differential analog inputs (temperature + heater voltage/current) |
| Stem Diameter Range | 7–25 mm (model-dependent) |
| Enclosure Design | EXO-Skin conformal wrap |
| Heater Architecture | Molded, low-thermal-mass resistive element |
| Environmental Protection | IP67-rated moisture barrier |
| Calibration Traceability | NIST-traceable thermistor and voltage references |
| Brand | Ecomatik |
|---|---|
| Origin | Germany |
| Model | SF-G |
| Measurement Principle | Granier Thermal Dissipation Method |
| Probe Configuration | Dual-needle, Constant Current Heating |
| Output Signal | 0–1000 µV differential voltage |
| Power Consumption | 0.2 W ±5% (84 mA @ 12 VDC) |
| Operating Temperature | –25 to +50 °C |
| Cable Length | Standard 5 m (extendable to 20 m) |
| Suitable Stem Diameter | >5 cm |
| Probe Variants | SF-G33 (33 mm needle / 20 mm heater), SF-G43 (43 mm / 20 mm), SF-G63 (63 mm / 20 mm) |
| Compliance | Compatible with ISO 17025-accredited data acquisition systems and GLP/GMP environmental monitoring workflows |
| Brand | Edaphic |
|---|---|
| Origin | Australia |
| Model | HPV-06 |
| Measurement Principle | Heat Pulse Velocity (HPV) |
| Flow Range | –200 to +1000 cm/hr (heat velocity) |
| Resolution | 0.001 cm/hr |
| Accuracy | ±0.1 cm/hr |
| Probe Diameter | φ1.3 mm |
| Probe Length | 30 mm |
| Thermistor Positions | 10 mm (outer), 20 mm (inner) |
| Inter-probe Spacing | 6 mm |
| Operating Temperature Range | –30 to +70 °C |
| Response Time | 200 ms |
| Heater Resistance | 39 Ω |
| Energy Input | 400 J/m |
| Power Supply | 12 V DC |
| Output Signal | SDI-12 |
| Cable Length | 5 m (max. 60 m) |
| Brand | Tianyan (Shandong Tianyan Instrument Co., Ltd.) |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Model | TY-JL01 |
| Measurement Principle | Constant-Heat Thermal Dissipation Method (Granier-type) |
| Probe Length | 33 mm |
| Inter-probe Spacing | 10–15 cm |
| Sensor Type | Paired T-type Thermocouples |
| Heating Element | DC-powered Constant-Current Resistive Heater |
| Data Storage | 2 GB SD Card |
| Sampling Interval | Adjustable from 1 to 99 minutes |
| Display | 320 × 160 LCD |
| Power Supply | 8.4 V Rechargeable Lithium Battery (Optional Solar Panel Integration) |
| Operating Temperature | 10–60 °C |
| Operating Humidity | 0–100 % RH |
| Material | Stainless Steel Probes with PTFE (Teflon) Coating |
| Channel Count | Single-Channel |
| Output | Instantaneous Sap Flux Density (g·m⁻²·s⁻¹ or mL·cm⁻²·h⁻¹, software-convertible) |
| Brand | WD Precision |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | WD-JL1000 |
| Price | USD 5,600 (FOB Beijing) |
| Core Technology | Granier-type Thermal Dissipation Probe (TDP) |
| Data Logger | Campbell Scientific CR1000x |
| Sensor Compatibility | TDP30 / TDP50 / TDP80 stem flow probes |
| Power Management | Adaptive low-power operation with AVRD voltage regulation |
| Environmental Rating | -40°C to +70°C (standard), -55°C to +85°C (extended) |
| Data Storage | Up to 400 days at 1-hour interval (128 MB internal + microSD up to 16 GB) |
| Communication | RS-232/RS-485, Ethernet 10/100 Mbps, USB-micro B, CS I/O, CPI/CDM |
| Input Capacity | 16 single-ended / 8 differential analog channels |
| Compliance | Designed for GLP-aligned field deployments |
| compatible with ASTM E2899-22 (Standard Guide for In Situ Sap Flow Measurement) and ISO 16634-1 | 2021 (Plant physiology — Sap flow measurement — Part 1: Thermal dissipation method) |