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DigitalFlow™ Multipurpose Ultrasonic Liquid Flowmeter Service Manual 1

Chapter 1. Calibration

1.1 Introduction

Calibrating the Model DF868’s analog outputs and inputs is explained in this chapter. In addition, testing the optional

totalizer/frequency and alarm relay outputs is discussed. The following specific topics are included:

• calibrating the built-in Slot 0 analog outputs

• calibrating optional Slot 1 through Slot 6 analog outputs

• calibrating optional Slot 1 through Slot 6 analog inputs

• testing optional Slot 1 through Slot 6 alarm relays

• testing optional Slot 1 through Slot 6 totalizer/frequency outputs.

The Model DF868 electronics console includes six expansion slots for the installation of option cards. These slots are

numbered 1-6, from right to left. In addition, every Model DF868 flowmeter includes two built-in analog outputs (A

and B) at terminal block

I/O, which is designated as Slot 0.

Note: Convention in this manual identifies any expansion slot as Slot x, where x is a number from 0-6.

See Chapter 1, Installation, of the Startup Guide for a complete description of the available option cards and the

procedures for wiring them.

1.2 Menu Map

The Calibration Menu is accessed by pressing the [CAL] key on the keypad. Use this menu to calibrate and test the Slot

0 analog outputs, as well as to calibrate and test any option cards that are installed in the expansion slots. Refer to the

menu map in Figure 6 on page 13 as a guide in following the calibration instructions.

Note: The same instructions apply to both the 1-Channel and 2-Channel versions of the Model DF868 flowmeter.

The following discussion assumes that the left screen pane is active. If the right screen pane is active, only the function

key designations change. That is, replace [F1]-[F4] with [F5]-[F8]. Proceed to the appropriate sections of this chapter to

calibrate and test all of the installed inputs and/or outputs.

Note: While in the Calibration Menu, if there is no keypad activity for two minutes, the Model DF868 will

automatically reboot and return to measurement mode.

GE DigitalFlow DF868 Service Manual

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