6
7.
With the tip in contact with the side of the receiving vessel, slowly and
smoothly press down on the cap until the turret reaches the stop and the solution
is completely discharged.
Maintenance
Periodically disassemble the lower body. Clean and lubricate the piston and
retainer to ensure smooth operation.
See Figure 1.
During reassembly, apply a
light coat of stopcock grease to the piston shaft and o-ring seal. Slide the
coupling over the housing extension and proceed with reassembly. Tighten the
coupling hand-tight only.
If the TenSette Pipet is to be used at an altitude significantly different than 1000
feet (305 meters) above sea level, the delivery volume will be affected.
See
Figure 2.
The instrument can be reset for greater accuracy as follows:
1. Remove the turret cap screw, turret cap and volume-setting ring. Loosen the
turret set screw by one or two turns.
2. Place a narrow-necked vessel (for example, a 25-mL volumetric flask) on an
analytical balance and zero the balance (or record the weight if the balance
is non zeroing).
3. Weigh the quantity of water dispensed at the 0.10-mL setting. Use only
high-quality demineralized water at 20-25ºC.
4. If the weight of the water is other than 0.10 g, use a small screwdriver to
give the turret adjustment screw (inside the metering turret) a slight turn.
Turn clockwise to increase delivery volume.
5. Zero the balance (or record the weight) just prior to adding another 0.10 mL
of demineralized water. If the added weight is other than 0.10 g, repeat
Steps 3 through 5.
