Instruction manual

Startup

continued

RFT9739 Field-Mount Transmitter Instruction Manual

Output Wiring Startup TroubleshootingBefore You Begin Getting Started Mounting

Power-Supply and

Sensor Wiring

Diagnosing zero failure

If zeroing fails, the LED blinks ON four times per second to indicate an

error condition. If the transmitter has a display, the blinking "Msg"

(message) indicator appears. The message screen will indicate the zero

failure with a message such as "*ZERO ERROR*", "*ZERO TOO

HIGH*", or "*ZERO TOO LOW*".

An error condition could indicate:

• Flow of fluid during transmitter zeroing

• Partially empty flow tubes

• An improperly mounted sensor

To clear a zeroing error, cycle power to the transmitter, ensure that the

tubes are full and the flow has stopped, and rezero again.

Additional information

about flowmeter zeroing

Flowmeter zeroing can be disabled using the transmitter’s security

modes.

Table 6-3

describes how RFT9739 security modes 1 through 8

affect flowmeter zeroing. Refer to

Section 2.3

, page 5, for more

information about security modes.

The transmitter has a programmable zeroing time (number of

measurement cycles), and enables the user to set the standard

deviation limits. For more information, see any of the following instruction

manuals:

•

Using the HART Communicator with Micro Motion Transmitters

•

Using ProLink Software with Micro Motion Transmitters

•

Using Modbus Protocol with Micro Motion Transmitters

Table 6-3. Effect of security modes on flowmeter zeroing

Performed with

Mode

Reset knob

Disabled Disabled Disabled Disabled Disabled Disabled Disabled

HART or Modbus device

Disabled Disabled Disabled Disabled