Tuttnauer 2540

Asset Type

Sterilizer

Manufacturer

Tuttnauer

Model

2540

Manual Reference

Operation & Maintenance Manual, Tabletop Autoclaves Models 1730, 2340, 2540, 3140, 3850, 3870 M & MK, Cat. No. MAN205-0007000EN, Rev. Q.

Manufacturer Recommendation / AEM Status

The manual lists preventive and scheduled maintenance at daily, weekly, monthly, annual, and as-needed intervals.

Manufacturer-Listed Maintenance Intervals

Daily

• Clean the door gasket with mild detergent, water, and a soft cloth or sponge.
• Before operation, verify the reservoir water level and add distilled water as required.

Weekly

• Clean the air jet.
• Clean and descale the chamber, copper tubing, and reservoir using Chamber Brite.
• Remove and clean the trays and tray holder.
• Lubricate the two door pins, door-tightening bolt screw shaft, and bearing.
• Clean the exterior with a soft cloth.
• Replace the reservoir water once per week or after 20 cycles, whichever occurs first.

Monthly

• Clean and functionally check the safety valve.
• Test the distilled or mineral-free water quality as recommended by the manual.

Every 12 Months

• Replace the door gasket every 12 months or as needed.
• Inspect the locking device for excessive wear annually.

Chamber Brite Interval Ambiguity

Section 8.1 lists Chamber Brite cleaning once per week. Section 9 also states to clean every 20 cycles or as needed. A conservative manufacturer-aligned approach is to perform the cleaning weekly, or sooner when 20 cycles occur before one week.

Manufacturer-Listed Replacement Parts and Accessories

• Tray: CT520010
• Tray holder: CV510010
• Tray handle: CT530020
• Pouch rack: AR920

The provided manual does not list a door-gasket part number.

Post-Repair Safety Inspection

The provided operation and maintenance manual does not list a defined post-repair electrical safety inspection procedure or electrical safety test limits. Perform functional verification after maintenance. Complete any required electrical safety inspection according to facility policy and applicable service documentation.

AEM Status

If a facility performs this PM at a different interval or changes the listed activities, handle the changes under the facility’s approved AEM program, risk assessment, maintenance history, and applicable regulatory requirements.

What This PM Procedure Covers

• Visual and mechanical inspection
• Door gasket, locking device, and door controls
• Chamber, reservoir, trays, and tray-holder cleaning
• Air-jet maintenance
• Safety-valve function check
• Reservoir water replacement
• Control, indicator, pressure, heating, exhaust, and drying checks
• Water-quality documentation
• Functional sterilization-cycle verification
• Electrical safety documentation when required by facility policy

Required Tools and Equipment

• Mild detergent
• Soft cloth or nonabrasive sponge
• Nonabrasive stainless-steel cleaner
• Distilled or mineral-free water
• Chamber Brite cleaner, one packet for the 2540
• Silicone reservoir drain hose supplied with the sterilizer
• Collection bucket
• Light machine oil, such as 3-in-1 oil, or white lithium grease
• Screwdriver or suitable hook for operating the safety-valve ring
• Appropriate personal protective equipment for heat and steam exposure
• Biological indicator and chemical indicator when included under facility sterilization-quality policy
• Electrical safety analyzer when required by facility policy

Do not use bleach, steel wool, a steel brush, or abrasive cleaning materials on the chamber or trays.

Step-by-Step PM Procedure

1. Remove the Sterilizer From Clinical Use

Action: Confirm the chamber pressure is at 0 psi. Turn the main power switch off and disconnect the power cord before cleaning, draining, inspecting, or servicing the unit.

Expected outcome: The unit is depressurized, cool enough to handle safely, and isolated from electrical power.

2. Inspect the Exterior and Installation

Action: Inspect the housing, controls, pressure gauge, power cord, plug, rear power socket, feet, labels, and ventilation openings.

Verify that:

• The unit rests on a rigid, level surface.
• All feet are installed and stable.
• Rear and right-side ventilation clearance is approximately 1 inch.
• The power cord and inlet show no heat damage, cracking, looseness, or exposed conductors.
• No visible water or steam leakage is present.

Expected outcome: The sterilizer is stable, undamaged, and properly installed.

3. Inspect the Door and Locking System

Action: Inspect the door, hinges, door-closing device, tightening bolt, locking components, door microswitch activator, and door bellows area.

Check for:

• Excessive wear
• Bent or loose components
• Cracks or corrosion
• Binding of the door-closing mechanism
• Evidence of steam leakage
• Proper activation of the door microswitch

Do not overtighten the door bolt. The manual directs that it be tightened hand-tight.

Expected outcome: The door closes securely, activates the microswitch, and does not bind or show excessive wear.

4. Clean and Inspect the Door Gasket

Action: Clean the gasket with mild detergent, water, and a soft cloth or sponge. Inspect for cracks, flattening, hardening, cuts, deformation, and evidence of steam leakage.

Replace the gasket if it has reached 12 months of use or is damaged or leaking.

When installing a gasket, position the widest side of its trapezoidal cross-section toward the door.

Expected outcome: The gasket is clean, smooth, flexible, correctly installed, and capable of sealing the chamber.

5. Clean the Chamber, Trays, and Tray Holder

Action: Remove the trays and tray holder.

Clean the trays and holder using detergent or a nonabrasive stainless-steel cleaner and water. Rinse immediately to avoid staining.

Inspect the chamber for:

• Mineral scale
• Black deposits
• Corrosion or pitting
• Debris
• Cracks or deformation
• Water marks indicating poor water quality or inadequate cleaning

Clean and descale using one packet of Chamber Brite for the 2540:

1. Begin with a cold and empty chamber.
2. Spread one packet in an even line along the chamber bottom.
3. Run a 273°F cycle without a drying phase.
4. For an M-series unit, use a 30-minute cleaning cycle from a cold start.
5. For an MK-series unit, use a 15-minute cleaning cycle from a cold start.
6. Exhaust the chamber.
7. Drain the reservoir.
8. Refill with distilled water.
9. Run a second cycle without Chamber Brite and without drying.
10. Exhaust and drain again.
11. Allow the unit to cool.
12. Wipe the chamber and tray holder with a damp cloth.
13. Refill the reservoir with distilled water.
14. Place 2–4 ounces of water into the chamber through the fill system, then remove it.

Do not sterilize instruments during the cleaning process.

Expected outcome: The chamber, trays, holder, tubing, and reservoir are free of visible deposits and cleaning residue.

6. Drain and Replace Reservoir Water

Action:

1. Confirm the power cord is disconnected and chamber pressure is 0 psi.
2. Attach the silicone drain hose and direct it into a bucket.
3. Open the reservoir drain valve counterclockwise.
4. Drain the reservoir completely.
5. Flush the reservoir using one quart of tap water.
6. Close the drain valve clockwise.
7. Refill with distilled water to just below the base of the safety-valve holder.

Do not fill above the safety-valve holder.

Expected outcome: The reservoir is clean, the drain valve closes without leakage, and fresh distilled water is installed.

7. Document Water Quality

Action: Verify that distilled or mineral-free water is being used. Review facility water-quality testing records.

The manual recommends monthly testing and lists the following characteristics:

• Conductivity at 20°C: ≤3 µS/cm
• pH: 5–7
• Appearance: colorless, clean, and without sediment
• Hardness: ≤0.02 mmol/L

Additional contaminant limits are listed in the manual and require recognized analytical methods and an authorized laboratory.

Expected outcome: The water source meets the manufacturer-listed water-quality criteria or is removed from use pending evaluation.

8. Clean the Air Jet

Action: Remove the reservoir cover and locate the air jet. Move the permanently installed cleanout wire back and forth through the jet orifice 10 times.

The manual allows this to be done with the unit idle or under pressure, but pressurized cleaning creates a hot-steam exposure. Follow facility safety policy.

Expected outcome: The air-jet opening is unobstructed. During heat-up and sterilization, steam should intermittently escape from the jet with an audible hissing sound.

9. Lubricate the Door Mechanism

Action: Apply a few drops of light oil to:

• Both door pins
• Door-tightening bolt screw shaft
• Door-closing device bearing

Remove excess lubricant.

Expected outcome: The door-closing mechanism moves smoothly without binding.

10. Inspect the Multi-Purpose Valve and Controls

Action: Inspect and operate the multi-purpose valve clockwise through:

• 0
• Fill Water
• Sterilize
• Exhaust/Dry

Also check:

• Main power switch
• Timer
• Thermostat control
• Pressure gauge and red tracking needle
• Power indicator
• Heat indicator
• Dry indicator

Do not force the multi-purpose valve or rotate it counterclockwise.

Expected outcome: Controls move normally, remain in the selected position, and show no damage or abnormal binding.

11. Verify Chamber Fill and Pitch

Action: With the chamber empty, use the Fill Water position to admit water.

For the 2540, the manufacturer-listed amount is:

• 12–15 ounces
• 350–450 mL

Water should cover the chamber bottom to within approximately ±½ inch of the front groove.

Adjust the front leveling feet only when necessary to obtain the correct water level and chamber pitch.

Expected outcome: The correct water volume enters the chamber and distributes properly across the chamber bottom.

12. Perform the Monthly Safety-Valve Test

Action: Perform this test only with appropriate heat and steam precautions.

1. Run a sterilization cycle at 273°F.
2. Allow chamber pressure to reach approximately 30 psi.
3. Turn the timer to 0.
4. Remove the reservoir cover.
5. Keep hands and face away from the steam path.
6. Use a screwdriver or suitable hook to pull the safety-valve ring open for approximately two seconds.
7. Release the ring.
8. Verify that steam discharges and that the valve closes immediately.
9. After testing, move the multi-purpose valve to Exhaust/Dry.
10. Wait until chamber pressure reaches 0 psi before opening the door.

If the valve sticks open, allow pressure to decrease to zero and repeat the test. If it sticks again, remove the sterilizer from service and arrange repair.

Expected outcome: The safety valve releases steam and reseats immediately without continued leakage.

13. Run a Functional Sterilization Cycle

Action: Reassemble the trays and tray holder. Run an empty or approved test-load cycle according to facility procedure.

Verify that:

• The power indicator illuminates.
• The heat indicator illuminates during heat-up and cycles once operating pressure is reached.
• The chamber heats and pressurizes.
• The pressure gauge responds smoothly.
• No steam leaks from the door, closing device, safety valve, or plumbing.
• The timer counts down.
• The buzzer sounds at timer completion.
• The Exhaust/Dry position vents the chamber.
• Pressure returns to 0 psi.
• The door remains locked while pressurized and opens normally after pressure reaches zero.
• The dry indicator and drying heaters operate during a drying cycle.
• The chamber drains without excessive residual water.
• No abnormal odor, noise, overheating, or circuit-breaker trip occurs.

For an M-series 2540, manufacturer-listed cycle examples include:

• Unwrapped instruments at 273°F: 30 minutes from a cold start or 14 minutes from a hot start.
• Wrapped instruments at 273°F: 34 minutes from a cold start or 18 minutes from a hot start.
• Packs at 273°F: 45 minutes from a cold start or 35 minutes from a hot start.
• Lower-temperature load at 250°F: 60 minutes from a cold start or 50 minutes from a hot start.

Use the correct M- or MK-series cycle table and load type.

Expected outcome: The sterilizer completes the cycle without leakage, overheating, control failure, or incomplete exhaust.

14. Verify Sterilization Performance Documentation

Action: Review chemical and biological indicator results according to facility sterilization policy.

The operator manual states that a biological spore test should be used at least once per week, while noting that testing standards may vary.

Do not substitute routine PM for the facility’s sterilization-quality monitoring program.

Expected outcome: Required chemical and biological monitoring results are acceptable and documented.

15. Final Inspection

Action: Confirm that:

• The reservoir is filled with distilled water.
• The drain valve is closed and not leaking.
• The chamber is clean and free of standing water.
• The trays and holder are correctly installed.
• The multi-purpose valve is in the 0 position.
• The exterior is clean and dry.
• All covers and components are secure.

Expected outcome: The sterilizer is ready for normal operation.

Electrical Safety Testing

The provided manual requires connection to a properly grounded outlet and a GFI outlet or circuit breaker. It does not provide preventive-maintenance ground-resistance or leakage-current test limits.

When electrical safety testing is included under facility policy, inspect the detachable power cord, appliance inlet, grounding connection, circuit breaker, and enclosure before testing.

Ground resistance measured in ohms, expected ≤ 0.5 Ω or facility/NFPA 99 criteria if different.

Result =

Touch/chassis leakage measured in microamps:

Facility limit used =

Result =

Pass / Fail =

Pass / Fail Criteria

Pass

• Chamber, reservoir, trays, and air jet are clean.
• Door gasket seals without leakage.
• Door and locking components operate normally.
• Safety valve releases and immediately reseats.
• Correct chamber-fill volume is achieved.
• The unit heats, pressurizes, times, exhausts, and dries normally.
• Indicators, gauge, timer, and controls function properly.
• No active steam, water, or electrical leakage is present.
• Required biological and chemical monitoring is acceptable.
• Electrical safety testing passes facility criteria when performed.

Remove From Service

• The safety valve does not open, does not reseat, or continues leaking.
• The door opens while the chamber is pressurized.
• The locking device, door bellows, or door-closing components are damaged or excessively worn.
• The door, gasket, closing device, or internal components leak steam.
• Pressure does not return to zero or the door cannot be safely opened.
• The unit overheats or repeatedly trips the cutout thermostat or circuit breaker.
• The unit cannot reach or maintain the required operating pressure.
• The timer, thermostat, gauge, heater, exhaust, or drying system fails.
• The chamber shows significant corrosion, pitting, cracking, or structural damage.
• Biological or chemical indicator failures remain unresolved.
• The power cord, inlet, grounding, or enclosure is unsafe.
• Electrical safety testing fails facility criteria.

Use the manufacturer service manual, facility policy, and approved AEM program to determine the final PM interval and return-to-service requirements.