Version 1.7 (June 2017)
TSI Flowmeters Ltd.
3
FLOWMASTER OPERATION
The pressure gauge does not need a power source to 
operate. Pressure measurements can be made with the 
ow meter in the OFF position.
The  Flowmaster  is  ready  to  measure  ow  as  soon 
as battery power is applied. Turn on the Flowmaster 
by pressing ON/OFF switch to “1” position. The 
Flowmaster can also be powered using an external 12V 
DC power source.
Following power_on, the ow meter begins a self test 
sequence  lasting  approximately  5  seconds  and  then 
automatically  enters  ow  measurement  mode.  The 
typical ow meter display in ow measurement mode 
is as shown below.
Fig. 3.3 Flow  meter  display  when  ready  for  ow 
measurement and there is no water in the pipe.  Note 
the ashing symbols on the left side of the owmeter 
gauge
Fig. 3.2 Flow  meter  display  when  ready  for  ow 
measurement, water is lling the pipe and is owing
Fig. 3.1 Flow  meter  display  when  ready  for  ow 
measurement,  water  is  lling  the  pipe  but  is  not 
owing
The Flowmaster is now ready to make both ow and 
pressure measurements.
7
3.1 POWER ON SEQUENCE
The Flow meter backlight LEDs will turn on. After 
a few moments, the self-test mode will commence 
and the display sequence will be as shown below.
The nal display in the sequence indicates that the 
self-test is complete and the Flow meter is in ow 
measurement mode.