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LF101A Leaf Wetness Data Logger

Complete data logging system that accurately measures and records leaf wetness

$579.00 CAD
Normally ships in 1-2 Weeks

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This Data Logger Requires IFC200 USB Cable & Software Package.

The LF101A is a complete data logging system that accurately measures and records leaf wetness. Not only does it record the presence of water but also logs the amount of water on the sensor. The sensor responds to environments the same way a real leaf does and can also detect when ice is present. This low cost system comes complete with a data logger, weatherproof enclosure and leaf wetness sensor.

The LF101A is ideal for plant disease forecasting, irrigation studies and monitoring frost cycles. It features a multiple start/stop function, ultra-high speed download capability, 1 million reading storage capacity, optional memory wrap, battery life indicator, optional password protection, programmable alarms and more. An IFC200 interface cable and software is required for use with the LF101A. The device can be started and stopped directly from a computer using the MadgeTech Software.

• Durable weather resistant housing for logger
• Precision leaf eetness densor
• Multiple start/stop function
• Ultra high speed download
• 1 million reading storage capacity
• Battery life indicator
• Optional password protection
• Programmable alarm
• Field upgradeable


Voltage Range


266 mV, typical

100 % Saturated

833 mV, typical

Voltage Resolution

50 µV

Voltage Calibrated Accuracy

± 0.01%

Specified Accuracy

Nominal range @ 25°C

Input Connection

6-position removable screw terminal

Reference Output

2.5 VDC, 2.5 mA (1 kΩ) maximum load

Temperature Effect on Span

< 25 µV over -40°C - 80°C

Temperature Effect on Offset

< 25 µV over -40°C - 80°C

Probe Measurement Time

10 ma

Probe Power

2.5 VDC @ 2 mA - 5 VDC @ 7 mA



1,000,000 readings;
software configurable memory wrap
330,000 readings in multiple start/stop mode

Reading Rate

4 Hz to 1 every 24 hrs

Wrap Around


Start Modes

Immediate start

Delay start up to 24 months

Multiple pushbutton start/stop

Stop Modes

Manual through software

Timed (specific date and time)

Multiple Start/Stop Mode

Start and stop the device multiple times without having to download data or communicate with a PC

Multiple Start/Stop Mode Activation

To start the device:

Press and hold the pushbutton for 5 s, the green LED will flash during this time.  The device has started logging.


To stop the device:

Press and hold the pushbutton for 5 s, the red LED will flash during this time.  The device has stopped logging.

Real Time Recording

This device may be used with PC to monitor and record data in real time

LED Functionality

Green LED blinks:

10 s rate to indicate logging

15 s rate to indicate delay start


Red LED blinks:

`0 s rate to indicate low battery and/or full memory

1 s rate to indicate an alarm condition

Password Protection

An optional password may be programmed into the device to restrict access to configuration options.  Data may be read out without the password.

Engineering Units

Native measurement units can be scared to display measurement units fo another type.  This is useful when monitoring voltage outputs from different types of sensors such as strain gauges and load cells.

Baud Rate


LED Indicators

Red & Green

Push-Button Start


Battery Type

3.6 V lithium battery included; user replaceable

Battery Life

10 months typical at a 1 minute reading rate with a 350Ω load
2 years typical at a 1 minute reading rate with a 1000Ω load

Time Accuracy

± 1 min/month at 20°C (68°F), stand alone data logging

Computer Interface

USB (interface cable required); 115,200 baud


XP SP3/Vista/Windows 7/Windows 8


ABS Plastic


8 oz (226 g)



2.9 in x 5.8 in x 1.5 in (74 mm x 148 mm x 39 mm) 


4.4 in x 2.3 in x 0.03 in (111 mm x 58 mm x 0.76 mm)

Cable Length

196 in (5 m)

IP Rating


Operating Environment

-10°C - 60°C (14°F - 140°F), 0% RH - 100% RH, Non-condensing

Required Interface Package


• Environmental studies
• Agricultural research
• Plant disease forecasting
• Plant watering
• Monitoring frost cycles
• Rainfall onset studies
• Irrigation studies

IFC200 Data Logger Interface
USB interface cable package for standard series data loggers
Normally ships in 1-2 Weeks
$172.55 CAD
LTC-7PN Lithium Battery
3.6 V, lithium battery, 750 mAH
Normally ships in 1-2 Weeks
$15.00 CAD
One set of replacement O-rings for the Waterbox101A
Normally ships in 1-2 Weeks
$7.25 CAD
Terminal Block
Pluggable terminal block for use with MadgeTech data loggers
Normally ships in 1-2 Weeks
Starting At
$4.35 CAD
MadgeTech 4 Secure Validation Software Package
IQ/OQ/PQ secure software validation workbook and software package
Normally ships in 1-2 Weeks
$2,030.00 CAD