An automatic built-in density meter is used to take the reading of the sample density. In addition, the densitometer also functions to dilute and cool the sample in preparation for the ion analysis. Analytical accuracy and repeatability are improved by compensating the density for temperature variations.
The potential difference measured between the ion selective electrode and the reference is used to determine the specific ion activity.
To compensate for temperature dependence in ion activity, a thermocouple measures the temperature in the sample during the test.
Concentrations of free acid are calculated as a function of ion activity. Total metals are calculated as a function of free acid concentration and density. The SA80 is a bullpup design, i. It uses a short-stroke gas piston system and fires from a forward-locking rotating bolt. Fire modes are single-fire and fully automatic. Chambered in 5. Once fielded, it wasn't long before some problems became apparent with the L85A1.
Soldiers found that magazines would sometimes drop out of their rifles without warning. The weapon was also prone to jamming. Use of the weapon in extreme climates showed up further shortcomings. Some of the plastic components of the gun would freeze, melt or break.
In operations in Sierra Leone, , members of the Pathfinder Platoon discovered that the safety catches on their SA80s failed in the heat, making their weapons useless. The SA80 is also a heavy gun, 1kg heavier than comparable 5. UKSF may still use the L85 when they need to look like regular forces.
The A2 addresses some, if not all of the shortcomings of the A1 and has been successfully taken to war in Afghanistan and Iraq. Features of the new rifle include a full-length Picatinny rail atop the upper receiver that can accomodate clip-on nightvision scopes. A new forearm has a Picatinny rail at the 6 o'clock position and Keymod rails at 3 and 9.
The forearm is free-floating, which should increase accuracy. The upper receiver has a new gas block. A stud has been fitted to prevent the change lever from over-travelling. The modifications result in the A3 being grams lighter than the A2.
Cosmetically speaking, the SA80A3 is finished in a flat dark-earth Cerakote anti-abrasive, water-resistant coating. The new paint job provides better camoflague and lesser infrared visbility. Army photo by Spc. It is a single-shot wepon that uses a side opening breech loading action. It can be employed in either direct-fire or indirect fire modes. It is essentially the same gun but with a longer, heavier barrel, bipod, shorter handguard and a vertical handgrip at the rear.
It was designed as a squad-level fire support weapon, with two per infantry section, able to deliver suppressive fire at a longer range and in higher volume than the L The longer barrel and bipod also enabled the LSW to be used as a quasi-sharpshooter rifle.
Despite these improvements, the LSW has never been that popular with the troops. In the fire support role, it has been superceded by the L minimi.
L86A2 Light Support Weapon. It was developed for use by vehicle drivers, helicopter aircrew, and crews of armoured vehicles, who needed an easily-stowable personal defence weapon in a more compact form than the fullsize L85A2. It was used by 43 Commando Fleet Protection Group boarding teams as its short length made it suitable for weilding in the tight interior spaces found on ships.
The L22A2's features a
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