13
User’s Guide 2018
Start-up and Operation
Before powering up the meter, consider the following:
•
Is the meter installed according to the direction of flow as marked on the meter
•
Has the wiring been carried out correctly and have all safety procedures been adhered
to
•
Is the supply voltage correct
•
Has the flowmeter been properly earthed
•
Lethal power supply voltages may be present, do not apply power with the electronics
module cover or terminal box cover removed
•
The SAFMAG is not suitable for installation in areas where explosive or flammable
gas, vapour or dust is present.
To put the SAFMAG ACP into operation, allow the pipe work to fill with liquid. Purge all
air from the pipe work and turn on the power. Allow time for the system to stabilise. With
no flow, check that the flowmeter is reading zero, that the analog output is reading 4 mA,
and that there is no pulse output.
Empty pipe detection is standard. When the converter detects high impedance in the
electrode circuit, typically caused by an empty or partially filled pipe, a signal is sent to the
microprocessor, which returns the flow reading to zero.
Although the empty pipe detection is standard, in some applications the conditions can
create a situation where the flowmeter will still read intermittently, and
it is essential that
for a trouble free installation the meter be full of liquid at all times.
CALIBRATION
Factory Calibration and programming
Before despatch the signal converter has been programmed, either to the factory
standard or to those specifications advised by the customer. The SAFMAG ACP
electromagnetic flowmeter has been calibrated at FLOWMETRIX flow laboratory with
direct traceability to the National Standards. The flow sensor will hold its stated accuracy
indefinitely provided that it is correctly installed and undamaged. The signal converter can
be verified using the SAFMAG calibrator.
Calibration Coefficient
Due to the design characteristics of the various SAFMAG flowmeters, each has its own
calibration coefficient (k-factor). This coefficient is determined during the factory
calibration, and will not change unless the flowtube is damaged.
Re-Calibration
The SAFMAG ACP microprocessor signal converter has been designed for programming
simplicity. The signal converters are interchangeable, and to re-calibrate a flowmeter the
new parameters must be entered via the four push buttons.
All set-up requirements are contained in the menus, and each item is stepped to by
pressing the
MENU
button.
NB:
The new data is only accepted if the ‘save & exit’ instruction is executed.
