Sensirion Liquid Flow SLQ QT105 Datasheet V80 pages

SLQ-QT105 Datasheet

High Purity Milliliter Flow Meter for Hydrocarbons
Sensitive to low flow rates
Straight flow channel
Maximum flows up to 2 ml/s
Fast measurement response for dosing monitoring
Super-fast sampling speed

1

Product Summary

The SLQ-QT105 Flow Meter offers an exceptional liquid flow sensing performance based on a thermal microsensor
technology. It is made for use with hydrocarbon based liquids. The fluidic part of the device is based on just a straight
flow path and no moving parts. Due to the short response time the SLQ-QT105 allows to monitor highly dynamic
processes such as fast dosing operations. In many applications this allows to increase process reliability and reduce
consumption of precious media.

2

Sensing Performance with Reference Medium Isopropyl Alcohol

In Table 1 the flow meter’s performance for use with Isopropyl Alcohol (IPA) is given. For other hydrocarbons the
values will be different as the performance depends on the used medium. The repeatability depends on the
averaging time of the signal. Longer averaging time leads to better repeatability of the flow measurement (see table
1).
Table 1: Model specific performance of SLQ-QT105 for IPA (all data at 23°C, 1 barabs unless otherwise noted)
Parameter
Maximum Flow Rate a
Repeatability (1σ)
(whichever is greater)
Flow Detection Response Time
Accuracy b
Response Time On Power-Up
Optimal Heat Up Time
Mounting Orientation Sensitivity c
Operating Temperature
Operating Pressure
Proof Pressure
Ambient Storage Temperature

Condition
0.2 sec averaging time

for constant flow measurement
for IPA; 23°C

(empty flow channel)

SLQ-QT105

Units

2000
2
0.3
< 50
10
< 120
500 – 1500
<5
+20 ... +25
12
32
-10… +60

µl/s
% m.v.
% F.S.
ms
% m.v.
ms
ms
µl/s
°C
bar
bar
°C

Medium IPA
With IPA, 50 - 2000 µl/s
c Normal position: horizontal flow channel, connector horizontally.
a
b

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Version 8 – April 2013

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