QMI TRIPLEX, Руководство пользователя

Страница: 33 / 54

Atmospheric Oil Mist Detection System
TM4 / AUGUST 2018
EMAIL qmi@oilmist.com WEBSITE www.oilmist.com 4 East Barnet Road, London, England, EN4 8RW TEL +44 (0)20 7328 3121
Sheet-33
QMI TRIPLEX 4-20MA ANALOGUE DATA OUTPUT
(OPTIONAL)
Location of Data Logger PCB Close up of Data Logger PCB
The data collected can be used to determine the cause of a build-up towards a possible
explosion and help find a solution.
The Monitor sends out a 4-20mA signal corresponding to the displayed mist percentage
for each Sensor. This is a digitally calculated reading taking into account temperature
non-linearities of the Sensors and oil deposit build-ups within the Sensor.
The signal can be recorded using a chart recorder, or data logger and corresponds to
the reading shown in the display.
Current = (Display % x 16 ÷156) + 4
Display 0 10 20 30 40 50 60 70 80 90
mA 4.00 5.00 6.00 7.10 8.10 9.10 10.20 11.20 12.20 13.20
Display 100 110 120 130 140 150 160 170 180
mA 14.30 15.30 16.30 17.30 18.40 19.40 20.41 21.40 22.50
The 4-20mA output from the Monitor is available on the 5-way connector, bottom
right of the Monitor as shown in the location of the data logger PCB image above.
Data Logger Harting Plug PIN Out
Harting PIN Channel / Voltage
1 1/0
2
2/0
3 3/0
4 12+Volts
5 No connection should be made to this terminal
Cable must be 4 core with a diameter of 0.5 mm
2
.