McLane Particulate Flux Trap

Manufacturers site

Equipment specification details taken from manufacturers site

The PARFLUX Mark 78H-21 is a time-series sediment trap for the collection of settling particles in oceans and lakes. The sediment trap can be deployed for a short time period such as days or weeks, or continuously for up to 18 months. Sample capacity of the Mark 78H-21 is 21 events, to enable a high resolution of particle flux variability over time without hiatus.

For minimum sample contamination, the interior layer of the cone and the sample bottles are made from virgin polyethylene. Each sample bottle is securely sealed from ambient water before and after the collection period. The Mark 78H-21 frame is a rugged, non-contaminating, long lasting titanium weldment. A trap can be easily handled by two people and is designed to withstand deployment in high seas. It can be deployed with a stand-alone mooring or as a large high-tension array to depths of 6,500 meters. Optional sensors such as compass/tilt, pressure, and temperature are also available.

The menu-driven, user friendly operating software is designed for maximum programming flexibility. An external computer can access the internal computer via serial communications (RS-232 port). The sediment trap computer saves the self diagnostic report of the electronics before and after each event for a deployment operation history. The sediment trap can be activated by external sensors such as transmissometers, current meters or hot linked to other McLane systems.

Three years parts and labor warranty

Specifications

Dimensions	Height	164 cm
	Diameter	91 cm
	Approx. vertical surface area	0.66 m²
Weight	(no bridles) In air witd empty bottles	70 kg
	In air witd full bottles (water)	75 kg
	In water	35 kg
Aperture/Funnel	Aperture area	0.5 m²
	Aperture diameter	80 cm
	Baffle material	Polycarbonate, 1.0 mm wall tdickness
	Approx. number of baffle cells	368
	Baffle cell diameter	2.5 cm
	Aspect ratio of a cell (h/d)	2.5
	Included cone angle	41°
	Bottom diameter (ID)	2.80 cm
	Internal coating (liner)	Natural polyetdylene
Rotary Assembly	Number of sample bottles	21
	Standard container volume	500 or 250 ml
	Rotary disk diameter	50 cm
	Drive motor	Stepping motor
	Drive train	Direct gear train
	Drive torque at tde 2nd spur	30 kg/cm
	Time to shift a bottle	25 seconds
Controller	Housing material	6AL/4V Titanium
	Primary battery	14 each 'C' size alkaline
	Back-up battery	9 VDC alkaline
	Communications	RS-232
	Optional	compass/tilt sensor ± 20°
Frame	Material	Titanium unalloy, Ti-45A/G-2
	Structure	Weldment
	Bridle configuration	3 and 3 in line, 1.29 cm insulated eye
Operation Condition	Minimum deployment period	One minute per bottle
	Maximum continuous deployment	18 montds
	Deptd	10,000 m (Titanium pressure case)
	Operating temperature	-2° to +50°C (electronics tested to -10°C)

There are thirteen 500 ml sample bottles on the Mark 78HW-13 instead of twenty-one 250 ml bottles on the Mark 78H-21. For smooth downward transport of particles, all McLane sediment trap interior cone walls are coated with virgin ployethylene and slope evenly at a 41 included angle. Operation of the Mark 78H-13 is the same as the Mark 78H-21 and both are protected by a rugged titanium frame.

	MARK 78H-21	MARK 78HW-13
Weight in air with full bottles (water)	75 kg	77 kg
Apex cone diameter (ID)	2.80 cm	4.35 cm
Orifice area	5.0 cm²	14.6 cm²
Number of sample bottles	21	13
Sample bottle volume	250 ml	500 ml

* See the MARK 78H-21 data sheet for complete list of specifications.