DigitalFlow™ Multipurpose Ultrasonic Liquid Flowmeter Startup Guide (1- and 2-Channel)
33
Chapter 3. Operation
Chapter 3. Operation
3.1 Introduction
See Chapter 1,
Installation
, and Chapter 2,
Initial Setup
, to prepare the system for operation. When the meter is ready
to take measurements, proceed with this chapter. The following specific topics are discussed:
•
Powering Up
•
Using the Display
•
Taking Measurements
Note:
All inputs and outputs of the Model DF868 are calibrated at the factory, prior to shipment. If it becomes
necessary to recalibrate any of the inputs and/or outputs, see Chapter 1,
Calibration
, of the
Service Manual
.
WARNING! To ensure the safe operation of the Model DF868, it must be installed and operated as described
in this manual. In addition, be sure to follow all applicable local safety codes and regulations for
the installation of electrical equipment.
3.2 Powering Up
Because the Model DF868 does not have an ON/OFF switch, it will power up as soon as the connected power source is
energized.
Note:
For compliance with the European Union’s Low Voltage Directive (73/23/EEC), this unit requires an external
power disconnect device such as a switch or circuit breaker. The disconnect device must be marked as such,
clearly visible, directly accessible, and located within 1.8 m (6 ft) of the Model DF868.
Immediately upon power up, the Model DF868 displays the GE logo and the software version (2AA) in the left pane of
the display window. The Model DF868 performs a series of internal checks and display the results in the right pane of
the display window.
Note:
If the Model DF868 fails any of the internal checks, try disconnecting the power and then re-powering the unit.
If the Model DF868 continues to fail any of the internal checks, contact the factory for assistance.
After successfully performing the internal checks, the Model DF868 begins taking measurements. The power up
display is replaced by a measurement mode display similar to that shown in Figure 13.
Note:
As a minimum, the system and pipe parameters (for each installed channel of a 2-channel meter) must be
entered before the DF868 can display valid data. Refer to Chapter 2,
Initial Setup
, for specific instructions.
Figure 13: A Typical Measurement Display
Proceed to the next section for a description of the components of the Model DF868 display screen.
SITE1 PIPE1
SITE1 PIPE1
VEL
VOLUM
-TOTL
+TOTL
