Starting Up CAL-V™
CAL-V™ may be performed at any time after installation and at any flow rate,
including zero flow. You do not need any extra equipment or paperwork to
perform a CAL-V™ test. Refer to "Performing a CAL-V™ Calibration Validation
Test" on p. 16 of this User's Guide to start CAL-V™.
Starting Up Zero CAL-CHECK™
There are a few ways that Zero CAL-CHECK™ is different than CAL-V™:
•
The Zero CAL-CHECK™ test must be performed at a "no flow" condition
(ie zero flow)
•
If the Zero CAL-CHECK™ test is to be performed in the pipe, the field
baseline must be set before an actual test can be performed (see "Setting
Field Baseline for In-Situ Zero CAL-CHECK™ Tests" on p. 9).
•
If the Zero CAL-CHECK™ test is to be performed out of the pipe, the
meter must be set upside-down (probe pointing up) and the PVC sensor
protector that the meter was shipped with must be placed back over the
sensor to achieve the factory baseline that the meter has been set with.
Techniques for Achieving Zero Flow - In the Pipe
In-situ (in the pipe) Zero CAL-CHECK™ testing can be achieved in one of two
common ways:
1. Fox Packing Gland Assembly
The first in-situ option is achieved through the use of a Fox Packing Gland
Assembly that may be ordered as an option for most inline- or insertion-
type meters. The assembly allows the operator to retract and isolate the
sensor from the process in order to conduct the Zero CAL-CHECK™ test.
This is particularly beneficial for applications in which the process is not
easily stopped.
2. Pipe Bypass / Valving-Off
The second in-situ option, if space allows, is to redirect the flow through
a bypass pipe section or valve off the meter in order to isolate the
meter's sensor in the place where it has been installed. While the flow is
redirected, the Zero CAL-CHECK™ test can be performed. Once the test
is complete, the valves to the bypass may be closed and flow may be
directed back to the meter's sensor where flow monitoring can continue
as normal.
Achieving Zero Flow - Out of Pipe
If space limitations prevent in-situ testing at zero flow as listed above, then
8
Start Up
Calibration Validation
ST
ART UP
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CAL-V
™
Zero CAL-CHECK
™
Achieving Zero Flow
- In-Situ (In the Pipe)
Achieving Zero Flow
- Out of Pipe