Macnaught 050 Manual - Flowmeter Mech
Page 4 of 14
Product Specifications
Problem
Cause
Remedy
Fluid will not flow
through meter
a) Foreign matter blocking rotors
b) Line strainer blocked
c) Damaged rotors
d) Meter connections over tightened
e) Fluid is too viscous
a) Dismantle meter, clean rotors (strainer must be fitted in
line)
b) Clean strainer
c) Replace rotors (Strainer must be fitted in line)
d) Re-adjust connections
e) See specifications for maximum viscosity
Reduced flow
through meter
a) Strainer is partially blocked
b) Fluid is too viscous
a) Clean strainer
b) See specifications for maximum viscosity
Meter reading
inaccurate
a) Fluid flow rate is too high or too low
b) Fluid is too viscous
c) Excess wear caused by incorrect
installation
a) See specifications for minimum and maximum flow rates
b) Bleed air from system
c) Check meter body and rotors. Replace as required. Refer
to installation instructions
Fluid flows but no
reading on meter
a) Bevel gear is loose on shaft
b) Rotor drive gear is damaged
c) Transmission gears damaged
d) Register gears damaged
a) Tighten grub screws
b) Replace rotor
c) Replace gears
d) Replace register assembly
Fluid leaks into
register
a) Seal worn or damaged on the cover
plate
a) Replace seal (Check seal compatibility with fluid)
Troubleshooting Guide
Flowmeter Mech
Metric
US
‘F’ and ‘M’ Meters
Flow Range
Below 5 cP
15 to 500 L/min
4 to 130 G/min
5 to 1000 cP
15 to 500 L/min
4 to 130 G/min
‘S’ Meters
Flow Range
Below 5 cP
30 to 300 L/min
8 to 80 G/min
5 to 1000 cP
15 to 350 L/min
4 to 93 G/min
Maximum Operating Temperature (Standard / High Temperature)
80°C / 120°C
176°F / 248°F
Maximum Operating Pressure
1
3400 kPa
500 psi
Accuracy of Reading
±0.5%
1. Conforms to Directive 97/23/EC—Cat 1