Valmar Calibration
Page 19
5 – Calibration
Calibration determines the actual product flow
rate of your applicator. Generally the metering
rate of fertilizer, granular product and seed is
predictable as long as its properties are
consistent. However, metering rate variations
are possible and may be caused by:
- Manufacturer’s quality control problems.
- A change in product density due to
settling in transport.
- Damaged or worn metering
components.
- Variations in seed size and density due
to changes in growing conditions.
For these reasons, product flow rate charts are
intended as a guide only. Calibration is
essential for accurate application. The
applicator should be calibrated the first time a
new fertilizer or granular product is used and
periodically thereafter. For see, the applicator
should be calibrated each time a particular
batch of seed is used. When applying seed
mixtures, consult the New Product Calibration
section of this chapter.
Use the following procedure to ensure that your
applicator is metering product as accurately as
possible. Refer to the Operation Chapter of this
manual for specific instructions on setting the
metering components.
Calibration Set Up
1. Pour sufficient product into both
metering bottoms for calibration.
2. Lower both manifolds by pulling the
latches on each side of manifold
assembly.
3. Install the funnels as shown in Figure 5-
1. Make sure the two tabs on the back
funnels each engage a venture cup.
Figure 5-1: Calibration Funnel
4. Place a large container under each of
the funnels to collect and weigh the
product in.
5. Ensure hopper gates are fully open.
6. Engage both metering drive clutches.
7. Remove the calibration crank from its
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