Midmark 91800138 Operating instructions

Brand: Midmark

Model: 91800138

Type: Operating instructions

Midmark 91800138 Flip Lever Retrofit Kit allows you to easily lock and unlock the CO2 absorber canister on your VMS or VA anesthesia machine. This can be especially useful when changing absorbers or performing maintenance on the machine. The kit includes all the necessary hardware and easy-to-follow instructions for installation. With the Midmark 91800138 Flip Lever Retrofit Kit, you can improve the efficiency and safety of your anesthesia machine.

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P/N 10435200 Rev AA1 7/22/21

Acorn nut

Tie rod

Knurled thumb nut

Plastic washer.

Retainer

Flip lever assembly

Instructions (VMS, VA):

Flip Lever Retrofit Kit….P/N 91800138

Thoroughly review all instructions before beginning any installation. Examine contents of package for

damaged or missing parts. If any damage is discovered and/or parts are missing, notify your Midmark

representative immediately…Tools required – 1/2-inch and 7/16-inch open end wrench, assistant. Perform

a system leak test and correct leak(s) (see page 3) prior to installing flip lever kit.

1. Remove acorn nut, knurled thumb nut, and plastic washer from

both absorber tie rods. Do not discard acorn nuts. Caution: On

VA absorbers hold lower

absorber assembly to keep

components from falling.

2. Install aluminum washer first, then plastic washer, supplied with

kit, over tie rod.

3. Be sure the plastic CO2 absorber canister is in place during this

step. While pushing down on VMS absorber assembly top, (on

VA units push absorber assembly together) insert the flip lever

assembly and retainer over the tie rod as shown in the photo.

Begin threading the retainer onto the tie rod, DO NOT

TIGHTEN. Repeat with other tie rod. While still pushing

down on the absorber

assembly top, (push together

on VA units) finger-tighten

the retainer against the flip

lever assembly, DO NOT

USE A WRENCH.

4. After both retainers are finger-tight, tighten each retainer

an additional 1/2 turn using a 1/2-inch wrench. DO NOT

TIGHTEN MORE THEN 1/2 TURN WITH

WRENCH. Note: hold flip lever assembly so as not to

turn while tightening the retainer.

Plastic washer

Aluminum washer

Push

Down

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P/N 10435200 Rev AA1 7/22/21

Midmark Corporation

For contact information, go to :

www.midmark.com

5. While holding the retainer with a 1/2-inch wrench rotate the

flip lever assembly so it points away from the center of the

absorber top, see photo. Repeat other assembly.

6. Insert the 3/16-inch long #4 setscrew into each of the retainers

and tighten. (0.05-in hex wrench supplied)

7. With the flip lever assembly still in the locked (down) position

insert the 1/8-inch long #6 setscrew into the lower threaded

opening of each bushing and tighten. (1/16-in hex wrench

supplied)

8. Open the flip lever assembly, insert the 1/8-inch long #6 setscrew

into the upper threaded hole of each bushing and tighten.

9. While holding the retainer with a 1/2-inch wrench, thread the

acorn nut (taken off in step 1) onto the tie rod and tighten the

acorn nut using a 7/16-inch wrench. Repeat for other tie rod.

10. Perform a leak test to verify system integrity (see page 3). Note:

leak(s) may not be related to installing lever kit.

To operate the flip levers push VMS canister assembly top down and hold. Push flip levers down to lock

position. On VA units push both flip levers down simultaneously. To open, push levers up.

In the event that the flip lever assembly needs to be tightened, remove the acorn nut and set screws, tighten

the retainer an additional 1/8 to 1/4 turn with a 1/2-inch wrench (see step 4), then repeat steps 5 through 10.

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P/N 10435200 Rev AA1 7/22/21

Midmark Corporation

For contact information, go to :

www.midmark.com

Veterinary Anesthesia Machine Pressure check

It is recommended that anesthesia machines be tested for leaks prior to each veterinary procedure in which

the machine is used.

1. Close the relief valve-exhaust (APL valve, dump valve, pop-off-valve, etc.) and place your thumb over

the patient connection of the Y-piece, found at the end of the breathing circuit.

2. Open the oxygen flowmeter and allow the pressure to fill the machine naturally. Once it reaches 30

cm/H2O on the pressure gauge, turn off the flowmeter.

Note: The breathing bag will inflate during this procedure; there is no cause for concern.

3. Observe the pressure gauge. If the pressure drops from 30-cm H2O to 27-cm H2O in less than 10

seconds then leak(s) must be fixed.

Common Places for Leaks

• Breathing bag and/or breathing circuit

• Breathing circuit point of connection to machine

• Unidirectional breathing valves

• CO2 absorber gasket(s)

• Relief valve-exhaust

• Vaporizer inlet and outlet connections; filler cap

• Fresh gas delivery hose and connection to machine

To locate leaks place hand over all connections, the breathing circuit, and bag, while system is pressurized,

and feel for leaks. For hard to find problems, wet hand or use soapy water solution over connections.

Evidence of bubbles will help locate leaks.

Midmark 91800138 Operating instructions

Midmark 91800138 Operating instructions

Midmark 91800138 Operating instructions

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