P/N: 974153 |
Rev: 072016
|
ECO: 46503
www.dynisco.com
From lab to production,
providing a window into the process
-13-
Deviation of the supply voltage from the value given in the technical specifications, or reverse polarity,
can damage the pressure transmitter and cause malfunctions that can pose a risk of explosion. Operate
only with an
intrinsically safe
, EMC compliant power supply with the following specifications when
employing the pressure 4-20 mA output:
Supply Voltage max.
Uo = 30 V
DC Current Output max.
Io = 100 mA
Power max.
Po = 0.750 W
The specified values of Lo and Co for the power supply need to be greater than Ci + Ccable and Li +
Lcable.
Internal Inductance
Li < 40 µH
Internal Capacitance
Ci < 4.5 nF
If the transmitter is installed in hazardous areas, only passive devices like switches or resistors may be
connected between the RCAL+ and RCAL- signals. Connection of any active electronic circuits or voltage
or current sources is not allowed.
Certain configurations of the SPX are also designed for use in hazardous areas as Explosion-proof and
Dust Ignition-proof by Factory Mutual for Class I, Division 1, Groups A, B, C & D, and Class II, III, Division
1, Groups E, F & G.
For SPX units that are explosion-proof approved for Class I, Division 1, Groups A, B, C & D the power
supply rating is 13-30 Vdc.
Additional Comments:
1) Do not remove the transmitter push-button seal screws in explosive environments when the circuit
is live.
2) Transmitter push-button seal screws must be fully engaged to meet Explosion-proof requirements.
3) Before connecting a HART handheld communicator in an explosive atmosphere, make sure the
instruments in the loop are installed in accordance with intrinsically safe or non-incendive field wiring
practices.
