Dwyer TFM-LP - Manual (Page 5)

F-20-TF-L, pg. 5 of 30
B. Installation
CAUTION: Do not flow any gas through a liquid flow sensor.
This may damage the micro-turbine assembly and void the
warranty. Do not exceed the pressure, temperature or power
operating ranges detailed in the Specifications section of this
manual. Dwyer Instruments shall not be liable for any damage or
injury caused by incorrect operation of their products.
1. General Considerations
It is recommended that a safety shut-off valve be installed upstream of
(before) the sensor.
All wetted parts should be checked for compatibility with the liquid to be
used. If there are any incompatibilities e.g. highly corrosive liquid, then the
unit may be damaged or fail prematurely. Such damage will not be
repaired under warranty.
Units should be installed in a clean, dry environment with an ambient
temperature that is as stable as possible. Avoid areas with strong magnetic
fields, strong air flows or excessive vibration.
If the liquid to be used may contain particles larger than 25 microns then a
filter (25 microns or less) should be installed upstream of (before) the unit.
The required differential press (or pressure drop across the unit) decreases
exponentially with decreases in flow rate.
Pressure Drop vs. Percentage of the Full Scale
Rated Flow (may vary ±10% of indicated psid)
0
2
4
6
8
10
12
10 20 30 40 50 60 70 80 90 100
% of rated flow
D
e
lta
P
p
s
id
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
De
lt
a
P Ba
r
100-1000 ml/min Units
All Other Ranges