Desiccant compressed air dryer 994-500

Overview
A lower-cost alternative for locomotives operating in the 3,000–4,000 hp range. The 994-500 is fully interchangeable with the 994-100 series and has half the moving parts of the original 975 Series, reducing initial and upkeep expense.

Details

• Operation: Twin-tower pressure-swing regeneration; 65 s cycle per tower (48 s regeneration, 17 s repressurization); one complete cycle every 130 s
• Desiccant: Activated alumina, bagged
• Max system pressure: 150 psig (10.0 bar)
• Temperature range: -40°F to +160°F (-40°C to +70°C); heater included
• Nominal inlet flow: 100 scfm (2826 l/min)
• Self-adjusting purge valve: automatically meters regeneration air based on inlet conditions
• Pressure drop: ≤ 5 psig at 100 scfm @ 100 psig & 105°F (without coalescer)
• Coalescing filter: 99.9% efficiency @ 0.3 microns
• Electrical: 18–138 VDC (74 VDC nominal); quick disconnect; 0.5 A max @74 VDC (heater off), 10 A max @74 VDC (heater on)
• Exposure/resistance: resistant to direct water spray and damage from flying debris
• Shock/Vibration/EMI: 10 g shock (3 axes); meets GETS & EMD vibration and EMI requirements
• Fatigue: NFPA T2.6.1-1974 cyclical category 3/90 @ 140 psig
• Dimensions: 29 in W x 24.22 in H x 16.5 in L (737 x 615 x 419 mm)
• Weight: 155 lb (45 kg) dryer; 75 lb (34 kg) mounting bracket
• Options: muffler; features: timer memory, multi-language labels

Technical specifications

• Model: 994-500 (interchangeable with 994-100)
• Type: Twin-tower PSA air dryer
• Nominal flow: 100 scfm (2826 l/min)
• Max system pressure: 150 psig (10.0 bar)
• Temperature range: -40°F to +160°F (-40°C to +70°C)
• Electrical: 18–138 VDC; quick disconnect
• Filtration: Coalescing filter 99.9% @ 0.3 µm
• Compliance: GETS, EMD, NFPA fatigue standard