Schaller Automation Visatron VN2020 User Manual

Operating manual  VISATRON® Oil Mist Detector  VN2020 / VN2020 EX
Part number 183001  Version 3.0
95
ASSEMBLY AND INSTALLATION
6.5.4 Setting the sensitivity on the VN2020 / VN2020 EX oil mist detector
The oil mist detector determines the oil mist concentration by optical measurement.
The calculated value is the opacity in percent. 100% opacity means that no more light
penetrates through the oil mist sample because of maximum turbidity.
The LEL (Lower Explosive Limit) corresponds to an oil mist concentration of 47 mg/l in
the air at a temperature of 25°C. The regulations of IACS UR M67 require that oil mist
detectors output an oil mist alarm at approx. 2.5 mg/l at the latest. The lowest sensitivity
of all VN2020 oil mist detectors, sensitivity setting 7, still ensures that an oil mist alarm is
output at oil mist concentrations < 2.5 mg/l. This fully complies with the requirements of
IACS UR M67.
NOTE
Setting the sensitivity on the oil mist detector
 The customer is responsible for deciding on the sensitivity of the oil mist
detector. The oil mist detector is set to sensitivity level 2 at the factory.
 To change the sensitivity of the oil mist detector, follow the complete
instructions for the VN2020 End User Software. They are available on the
DVD, which is included in the delivery.
WARNING
Setting the sensitivity on the oil mist detector
 Familiarise yourself with the basic safety instructions before starting electrical
installation.  Section 2.4 Basic safety instructions
 If the oil mist detector is operated in explosion-proof areas, the relevant safety
instructions must be observed.  Section 2.4.1 Safety instructions for potentially explosive
atmospheres
The following table illustrates the assignment of the set sensitivity against the relative
opacity.
VN2020
Sensitivity setting
[Sensitivity]
Oil mist concentration alarm level
[mg/l]
Opacity alarm threshold
[%]
1
0.55
1.50
2
(Default factory
setting)
0.70
2.00
3
0.90
2.50
4
1.10
3.00
5
1.40
4.00
6
1.80
5.00
7
2.50
7.00
Once the end-user software has been installed and configured on your PC/laptop and a
data connection to your oil mist detector has been established, the sensitivity of the oil
mist detector can be set on the PC/laptop as shown in the figure and steps below:

Schaller Automation Visatron VN2020 Specifications

General

Brand	Schaller Automation
Model	Visatron VN2020
Category	Security Sensors
Language	English