Cleanup and check of a Mettler Instruments K4T single pan top loading balance.
After owning and using this K4T balance for over twelve years, I thought it was time for a full cleanup and accuracy check. When first purchased from Ebay it received a quick cleanup, function, and accuracy check, before I quickly put it to use.
I already owned several other Mettler K5 and K7 balances, and the K4T is basically an updated version of the K5T. According to Mettler’s website the K4 has been discontinued since: Jan, 1965.
Now that I am retired I thought the old K4T deserved some attention. I did a fairly extensive search of the internet, but did not find much information or photos of Mettler’s K4 balance, which replaced the Gram-atic 4000 series of balances.
So while cleaning I took the time to photograph the internals of the K4T.
The Mettler K4T balance is a single-pan balance, for rough weighing.
The weight readout is by graticule projected on to a ground-glass screen. It has a capacity of 4,000 grams with a precision of +/- 0.2 grams. The beam uses magnetic dampening with a stable readout in 2 to 5 seconds. The display has an optical range of 1,000 grams with 1 gram divisions. It has built-in substitution weights of 1 and 2 Kg, along with an adjustable spring type tare function of 500 grams. This unit was built in the late 1950“s.
Click on gallery images for larger view.
- Some helpful notes for shipping Mettler K Series balances:
- First unplug the balance from power source.
- Remove the pan and pan base from the top of balance.
- Carefully remove the metal top cover section straight up, making sure not to put pressure on the front display bezel.
- Carefully remove the substitution weights from their holders and place on a clean soft surface such as a towel.
- Turn the “ARR.” knob on the lower back of the balance in the direction of the arrow to arrest the beam.
- Check that the knife edge pivots raise up, and the balance beam is secured and not loose.
- Using a flat blade screwdriver loosen the screw in the center of the weight range selection knob two turns. Gently pull straight out clearing the side pin from the case.
- Replace the metal top cover on the balance.
- If the balance has a tare knob on the left side, it is not removable and extra precautions will need to be taken in protecting it such as added padding on the left side around the knob. The knob will not survive a direct impact during shipping!
- The pan, pan base, substitution weights, and range selection knob should all be wrapped and packed separately from the balance. No loose items should be inside the balance case.