21.
This concludes the pH meter checkout. Clean your work area and verify your readings
with the Work-Center Supervisor. Upon receiving a GO on the Performance Checklist,
proceed with the specific gravity Checkout.
SPECIFIC GRAVITY.
A hydrometer is an instrument calibrated to the weight of distilled/pure water, and is used to determine
the specific gravity of other solutions (figure 21).
Figure 21
Hydrometer
All measurements should be made at the same temperature. Readings which correspond with known
standards indicate proper mixing and/or replenishment. The hydrometer is graduated in units of 0.002
and reads from the top down. All readings will be four digits (EXAMPLE 1.082, 1.065).
OPERATION PROCEDURE:
1.
Take a sample of the developer and fixer (approximately 550 mil) from the EH-38.
2.
Pour the samples into large beakers.
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