Gilson Porta Screens® offer rugged, lightweight portable solutions for quality control at asphalt and ready-mix plants, with performance, durability and mobility. Designed for best separation in the 2in (50.8mm) to No.16 (1.18mm) range, Porta Screens® can efficiently process materials down to No.200 (75μm) sizes. Capacity depends on test material characteristics, but may range up to 60lb (27.3kg) per test. Vibration is mechanically counterbalanced for smooth, stable operation and units do not require mounting.
PS-3 models are equippped to hold five screen trays and pan.
PS-4 models accommodate seven trays and a pan, enabling for two added mesh sizes per test.
PS-3 and PS-4 models fit inside the TSA-180 Sound Enclosure.
A built-in electronic digital timer displays remaining test time and automatically resets to programmed time at completion. The timer can run up to 99 minutes, 59 seconds and a pause feature allows interruptions without test time loss. Screen Trays are purchased separately and have a 14x14in (356x356mm) clear screen area. Trays are quickly secured for operation using the dual hand clamp levers. When levers are released, trays are individually-removable for convenient emptying, cleaning, and weighing operations.
Mesh sizes No.4 and larger have metal shields around edges to cover partial openings for accuracy of separations. Trays with wire cloth in the No.16 to No.80 (1mm to 180μm) range have three added support ribs. No.100 (150μm) and finer trays are supplied with backup cloth support. Replaceable stainless steel mesh is available in all sizes.
The vibrating assembly is mounted on hardened guide pins. The 1/3hp motor, drive shaft, connecting rod, and rotating weight counterbalance system are all enclosed by the enameled steel case. The machine is easily leveled with a foot tab adjustment of the three support legs, guided by an indicator bubble on the top frame. The optional PSA-312 hinged Porta Cover is quickly installed to cover the top, preventing sample loss and reducing nuisance dust. Porta Wheels are an additional option to enhance mobility of these units; the ball-bearing mounted rubber wheels attach quickly to pre-drilled holes in the frame of the Porta-Screen. The optional PSA-367 Porta Sample Pan is a convenient accessory that can be used for loading sample materials, and holds inverted trays for emptying and cleaning. The pan allows for easy handling with its swing-away handle and end handle grip.
- Counterbalanced mechanism offers smooth, quiet operation
- Programmable timer with LED display offers optimal repeatability
- Lightweight, portable frame is ideal for mobile applications
- Gilson PS-3 or PS-4 Porta Screen®