Optosense LLC
USER MANUAL
Design department
SMALL-SIZE EXPLOSIVE GAS MEASURING
SENSOR MIPEX-02-X-X-X.1 X (RX)
ESAT.413347.005 UM
Revision 3.0
January 19th, 2017
Page 12 of 46
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6.3. Electrical conditions
During first 0.1 seconds after power up, sensor consumes up to 25 mA, and
then during one second average current consumption is about 10 mA (see Fig.
1). After that sensor switches to the normal current consumption mode.
During operation, MIPEX-02 has pulsed current consumption. Pulse repetition
period is 10
± 20% ms (depends on ambient temperature).
During operation, maximum surge current is 10 mA (see Fig. 2). Average
current consumption is not more than 1 mA (for power consumption of sensor
connected via barrier see Fig. 4 and Fig. 5).
Average current consumption may increase up to 10 mA over about 60 ms
when UART is active. Pulse repetition period is increased by the time of data
processing on UART (see Fig. 3).
Use intrinsically safe circuit connections represented in Appendix B.
Sensor power supply has to follow requirements of IEC 60079-0 and IEC 60079-11, with
rated output range of intrinsically safe DC voltage (U
0
) of +
3.0…+5.0 V, with rated power range
(P
0
) of 0.02…0.25 W. Current provided by power supply unit must be 25 mA < I
0
≤ 450 mA.
End-user equipment UART transceiver should meet the requirements of standards
IEC 60079-0, IEC 60079-11.
Sensor UART transceiver communication properties are:
High logic level for transmitting line TxD is in range of +2.4
…+2.7 V;
High logic level for receiving line RxD is in range of +2.4
…+3.4 V;
Low logic level is in range of 0
…+0.8 V;
Maximum output current of UART is not more than 25 mA.