Hertz Kompressoren Laser Series (high pressure)
High-pressure oil-injected screw range (14.5–20 bar) aimed at laser cutting and other elevated-pressure process duty.
Type
Oil-flooded rotary screw
Power
15–50 hp (11–37 kW)
Flow
5.6–162 cfm (0.16–4.58 m³/min)
Pressure
210–290 psig (14.5 / 16 / 20 bar)
Cooling
air
Drive
belt-or-direct
Lubrication
oil-flooded
Models
Laser 11 – 37 kW, 14.5 / 16 / 20 bar
Typical applications
- Laser cutting
- PET / bottle-adjacent processes
- High-pressure tooling
Specs & intervals below are from publicly published OEM literature and long-standing field practice. Torque values, exact revision-dated part numbers, and safety-critical settings vary by serial number — always cross-check the unit’s OEM manual and nameplate before ordering parts or performing service.
Fluid
Spec: High-pressure duty screw fluid per the OEM chart
Change interval: Shorter than standard-pressure packages — follow the panel counter
High-pressure duty runs hotter; oxidation life is shorter. Sample the oil if the unit runs continuously.
Wear parts
| Category | Interval | Source |
|---|---|---|
| Air filter element | 2,000 hr or on ΔP | |
| Oil filter | 1,000–2,000 hr (high-pressure duty) | |
| Oil separator element | 4,000 hr | |
| High-pressure hoses and fittings | Inspect annually — replace on any weeping | |
| Safety relief valve | Test annually |
Consumable part numbers change by revision and region — pull the current number from the OEM portal.
Preventive maintenance
Daily
- Check fluid level in sight glass at running temp
- Listen for unusual noise / vibration
- Check discharge pressure & temperature vs baseline
- Verify condensate drain function
- Log package amps if metered
Weekly
- Blow down receiver and drain traps
- Check for oil carryover at first drop leg
- Inspect for fluid or air leaks around airend and separator tank
- Verify safety valve is not weeping
Every 2,000 hr / 6 mo
- Change fluid filter
- Change air filter (or sooner per ΔP)
- Sample fluid for TAN / metals / water
- Clean cooler exterior with low-pressure air (never > 30 psi against fins)
Every 4,000 hr / 12 mo
- Change separator element
- Change fluid
- Inspect scavenge line & orifice for coking
- Check coupling / belt alignment & wear
- Torque electrical lugs to spec (typ. 45–75 in-lb #4–2/0 AWG)
Every 8,000 hr
- Rebuild inlet valve
- Rebuild minimum-pressure check valve
- Regrease or replace motor bearings per OEM interval
- Verify safety valve setpoint against gauge
Common faults & first checks
- Elevated oil temperature — normal for HP duty but easy to push past the trip in hot rooms
- Oil carryover if the separator is run past interval at pressure
- Relief valve weeping after years at setpoint
Controller(s)
- Hertz Screw Compressor Controller (HSC / HSC-D / HGS panel) — Backlit alphanumeric LCD control panel with membrane keypad and status LEDs. Larger frames ship with the graphic touch-style panel. Exact panel varies by frame, build year and region — confirm against the panel label.
Strengths
- Purpose-built for 14.5–20 bar laser-cutting and process duty
- Compact for a high-pressure package
Weaknesses
- Shorter fluid and separator life than standard-pressure units
- Small capacity range — sizing must be exact
Field notes
From the public Laser series brochure. High-pressure work: never service without full depressurization and lockout.