ML1 Event Logger

The ML1 is a one channel data logger specifically designed for recording rain fall events, both amount and intensity, from tipping bucket rain gauges. As only events are recorded, battery life is extended and data storage is minimised. Very low power consumption and a robust aluminium waterproof housing allow this logger to be deployed in the field for up to five years in remote locations.

Events are stored in the memory, which can then be downloaded to a computer, using WinComLog to download and graph data which can be used in Excel. An RS-232 serial port allows the direct connection of the ML1 to a computer on site. WinComLog can be set up to record specific minimum event amounts, for example, if the tipping bucket is 0.2mm and the required recorded event must be in increments of 1mm then set the INC field to be 0.2 multiplied by 5.

Advantages of event loggers over timed interval loggers:

Rainfall intensity can be determined because the time of every tip is recorded. This is, for example, especially useful for studying soil erosion.
Each event is time stamped allowing graphic visualisation of rainfall and rainfall intensity over time. (Sample graph)
Minimises power usage.
The event logger data set does not contain any nulls (Sample file). Timed interval data sets can contain many rows of non-data (Sample file) and depending on the interval may fill memory more quickly.

Features:

Small and Compact
Low power consumption
Records events rather than time intervals
Memory Wrap for continuous logging

ML1 Event Logging Pluviometers
PLVML1-100			PLV4
PLV6			PLV3

Specifications
Events Recorded:	100,000 events
Communications:	RS232 Port, (Tx, Rx)
Dimensions:	65x 60x 40 mm
Weight:	200 Grams

Research Grade Pluviometers

Feature Comparisons
	PLVML1-100	PLV6	PLV4	PLV3
Click the image thumbnail for full size
Print Brochure		PLV6 Brochure	PLV4 Brochure	PLV3 Brochure
Rain Gauge	ECRN100	TB6	TB4	TB3
Suitable for:	Low rainfall intensities	Low rainfall intensities	High rainfall intensities	High rainfall intensities
Factory Calibration:	–	Standard	Standard	Extensive
Tipping bucket:	Double-spoon ABS	Double-spoon Chrome plated ABS	Double-spoon Chrome plated ABS	Double-spoon Choice of synthetic ceramic coated brass bucket balanced to ±0.05 gms (TB3 M) or chrome plated ABS (TB3 P)
Base:	n/a	ABS	ABS	Diecast aluminium
Catch / Enclosure:	ABS	Powercoated aluminium	Powercoated aluminium	Powercoated aluminium
Mounting:	Attach to post or pole	Three 10 mm diameter mounting holes at 117 mm p.c.d. in feet moulded to outside diameter of base
Bucket pivot system:	ABS moulded with metal axel	Two stainless steel rolling bearings, mounted at 90 degrees to bucket axle		Ground sapphire pivots with hard stainless steel shaft
Tip Size:	0.2 mm	0.2 mm Standard and 0.5 mm Optional		0.2 mm Standard or 0.5 mm and 1.0 mm Optional
Resolution:	0.2 mm	0. 2 mm / 0.5 mm		0. 2 mm / 0.5 mm / 1.0 mm
Range:	0 to 300 mm rainfall/hr	0 to 500 mm rainfall/hr	0 to 500 mm rainfall/hr	0 to 700 mm rainfall/hr
Overall Height:	140 mm	342 mm	342 mm	342 mm
Level:	Level bubble in enclosure	Bullseye level at base
Accuracy:	±5%	±2% from 0 to 100 mm/hr. ±3% from 100 to 300 mm/hr	±2% from 25 to 300 mm/hr ±3% from 300 to 500 mm/hr
Syphon:	No syphon	No syphon, funnel only Suitable for low rainfall intensities	Syphon system made from brass with a non-hygroscopic* outer case Long term calibration and accuracy ensures stability at high rainfall intensities (* Non-hygroscopic materials do not absorb moisture)
Collector Diameter:	165 mm	200 mm
Measurement Units:	Millimetres	Millimetres
Humidity Range:	0 to 100%	0 to 100%
Switch Closure:	–	Dual reed switches potted in soft silicon rubber with varistor protection
Packed Dimensions:	1.5 Kg, 0.022 m³	3.2 Kg, 0.03 m³
ML1 Event Logger	PLVML1-100	PLV6	PLV1	PLV2
Features:	Only records tipping events, saving data memory and battery. Very low current consumption.
Power Consumption:	Closed switch with expected life of 2 to 3 years	Open switch with expected life of 2 to 5 years depending on rainfall environment
Battery:	Single 3.6V Lithium battery
Data Memory:	512KB Serial Flash EPROM records up to 100,000 events with 1 second resolution
Communications:	RS232 Port, (Tx, Rx)
Dimensions:	65 mm x 60 mm x 40 mm
Weight:	200 gms