Fisher & Paykel MR850 Humidifier

[@landongrier7792]

Great video, it helped so much, we have a ton of these at my facility we have to PM every year

[@nicolemarsh1391]

There's a fun little trick for these! Pushing the top right button when doing the calibration takes you from the first mode to the second without having to scroll through the menu again to get to the second calibration =)

[@G1rootuser]

Hey, I just wanted to follow up on an issue with electrical safety and the MR850's. There are three screws underneath the heater place (service manual Rev J, page 39, figure 7.6). These screws keep the heating plate attached to the unit, but can loosen. With the increased air gaps in the screws come extremely high ground resistance (ohms) values. Tightening these screws helps display the true resistance characteristics of the unit. Due to the nature of the unit and design of the PCB (heating element, component choices), these units also typically have high leakage values (Neutral, L2 Closed: >100 uA). Thankfully my facility has the TAP Agreement with Fisher and Paykel, at that point I send back (an ungodforsaken amount of units) back to them.

[@BetterBiomedChannel]

I have 2 electrical safety analyzers setup and we also ship out all humidifiers that are defective

[@artad6420]

great video! looking forward to more videos for biomed PM equipment

[@tailzer42]

Just a couple comments, the heater wire in the tubing is to reduce rain out, this is where the heated humidified air hits the sides of the tubing which will be cooler and this creates condensation drops which will then pool and block the HME filters at the patient end. Common problem in ICU can be a fan blowing cool air onto patient blows across the breathing tubes and increases the rain out effect. Also the man in the box dosnt mean double insulated (thats a box in a box), it refers to type BF patient applied part.

[@BetterBiomedChannel]

It took longer than expected for someone to correct me on the symbol. Regardless, 1/3 of these device will not pass an electrical safety test because the platter is not directly connected to the integral electrical components

[@tailzer42]

@@BetterBiomedChannel MR850 you will always get an earth resistance of less than 0.2 ohm from the heating plate, otherwise it is faulty, agree there are others out there that are double insulated though.

[@tvsparks47]

@@tailzer42 I would just like to say when you do the electrical safety testing you need to clip your earth lead to the heater plate at the front middle of the blue finger guard. I believe there might be a coating on other parts of the plate. Internally the earth contact screws directly onto the plate btw. ( UK version) so I guess the comment above about plate screws giving a bad earth is not correct. I'm working on a MR850 now, you might be interested in the fault. Came in with "not heating" on the fault description, I ran it on test where it performed reasonably well, however the temperature did seem high at times. Switched off over night and the unit was alarming Heater chamber, heater wire and temperature sensor when it was switched on in the morning. I then opened it up to find the PCB had water damage residue on the lower part of the board. I guess the unit had been sat in water. Easy faults on this unit are the heater plate cut out you can reset this by pushing through a small hole inside the unit. Usually comes up with an error code E21. The mains transformer often buzzes, tighten the screws which hold it, plastic sealer or replace. There is a replacement improved PCB should you need to replace the PCB.

[@mateo801]

Keep them coming! Thanks a bunch!

[@MrBiomedical]

Excellent video♥️ that helps too. Thank you so much

[@BjornV78]

Hi Justin, in the calibration jig are probably 2 resistors buildin that each represent the value of a certain corresponding value from a thermal sensor, so mayby stupid question, but why are there 2 temperature values ? Ambient temperature and heating temperature ?

[@BetterBiomedChannel]

I do know that after the calibration, I inserted the gray key and it registered 40degc. I'm thinking that 40degC is about right since body temp is 37degC. So the gray is calibrated value and the blue is either ramp up max value or it's low temp (if the ohms is NTC )

[@MattHumanPizza]

They took away the temperature adjustment feature with this model. Unless there is one. Anyone know?

[@BetterBiomedChannel]

Isn't it an auto calibration to their proprietary calibration jig?

[@sayedrezahossaini501]

Great job

[@MrBiomedical]

Worth video👍

[@mikec3652]

The back of my mr850 says the water heater and circuit heater are around 250-300w, however when i try to ise a portable battery device capable of 500w and when i try a 750w dc converter, both throw errors on the humidifier and will not work. I origionallt thought it was a ground problem, so i made a 3 to 2 ground cord grounding neutral and ground together, but this did not solve the issue either. I also tried plugging in my 3 prong humidifier i to a 2 pront extension cord in my house outlet, and this did work correctly, which leads me to believe the issue is not neutral/ground related. Does anyone have advice for my issue? I want to make this humidifier mobile.

[@BetterBiomedChannel]

Connect the humidifier into your electrical safety analyzer and check the device current.

[@jeffreygomzalez3825]

Thank you!

[@matthewmatice6315]

Thank you so much. Do these require electrical safety checks each year?

[@BetterBiomedChannel]

To be honest, The type BF rating (Man in a square symbol) means that the patient circuit is not connected to ground in any way. Normally the platter would be a good ground but since the platter touches the liquid that has the potential to touch the patient, I bet the platter isn't grounded at all. I will take actual Ohms readings tomorrow to prove or disprove that.

[@matthewmatice6315]

@@BetterBiomedChannel Thank you, I'm looking forward to your follow up.

[@MrMdynex]

Did you ever figure anything out for this?

[@BetterBiomedChannel]

@@MrMdynex yes. The platter on half of the units tested will not pass Electrical Safety due to poor conduction at the spring beneath the platter.

[@tvsparks47]

@@BetterBiomedChannel The plate is definitely grounded! Its a 1BF device. 1 because it uses an earth. (UK device)

[@onyinyechindukwe8681]

Please how can someone reduce the humidifier temperature

[@BetterBiomedChannel]

Do you have the temp calibration jig from F&P?

[@unforgiveniii4000]

do you know about the software process i have a cable but i don't know what it does

[@BetterBiomedChannel]

The manual talks you through the calibration process

[@unforgiveniii4000]

@@BetterBiomedChannel have you ever done it before

[@richardwright6872]

Is there any difference between this & the Airvo 2 ?

[@BetterBiomedChannel]

The Airvo 2 is a gas mixer as well as a humidifier

[@jesusguillenquinto8717]

traduccion x favor

[@DumpThump]

I hate these things