Filter
Top Products
Setup
44 312759R
Calibrate Dispense Weight Ratio
(PR70v only)
The PR70v base unit can dispense volume ratios in the
range of 1:1 to 24:1. The range of A to B cylinder size
ratios is 1:1 to 12:1. The mechanical ratio arm multiplies
the constant cylinder size ratio by a range of 1:1 to 2:1
depending on the ratio arm adjustment.
Prepare Machine for Dispense Weight Ratio
Calibration
1. Verify the piston position is calibrated. See Piston
Position Calibration, page 37.
2. Verify the dispense head is properly primed. See
Prime the Dispense Head, page 39.
3. Verify the machine is properly phased. See Phas-
ing Adjustment, page 40.
4. Find the desired ratio arm setting from 1:1 to 2:1.
a. Divide the side A piston size by the side B pis-
ton size to get the piston volume ratio. For
example, if the A piston size is 960 mm
2
and the
B piston size is 480 mm
2
then 960 / 480 = 2.
b. Divide the desired dispensing volume ratio by
the piston volume ratio to get the desired ratio
arm setting. For example if the desired dispens-
ing volume ratio is 2.38:1 and the piston volume
ratio is 2:1 then 2.38 / 2 = 1.19.
FIG. 28: Ratio Adjustment
201
203
204
Key:
201 Ratio Adjustment Knob
202 Ratio Beam
203 Socket Head Cap Screws
204 Hex Head Cap Screw
205 Ratio Beam Guide
206 Ratio Beam Snap Ring
202
ti12390a
205
206
A Tube
Piston Size
(mm
2
)
B Tube
Piston Size
(mm
2
)
Minimum
Ratio by
Volume
(1:1 Position)
Maximum
Ratio by
Volume
(2:1 Position)
960 960 1:1 2:1
960 480 2:1 4:1
960 320 3:1 6:1
960 240 4:1 8:1
960 80 12:1 24:1
For this step, the desired volume ratio must be
known. Using the desired weight ratio will cause
calculation errors.