Emerson 781, Quick Start Manual

Page: 14 / 24

Input parameters
(power terminals) Input parameters
(sensor terminals) Output parameters
(sensor terminals)
L
i
= 3.3 μH L
i
= 2.2 μH L
a
/L
o
= 2 mH
Special Conditions for Safe Use (X)
1. The Rosemount 781 transmitter housing contains aluminum and is
considered a potential risk of ignition by impact or friction. Care must
be taken into account during installation and use to prevent impact
and friction.
2. The surface resistivity of the unit is greater than 1 gigaohm. To avoid
electrostatic charge buildup, it must not be rubbed or cleaned with
solvents or a dry cloth.
3. The Rosemount 781 transmitter will not pass the 500 Vrms electric
strength test and this must be taken into account during installation.
6.5 Canada
I6 Canada Intrinsically Safe
Certificate CSA 2330424
Standards CSA C22.2 No. 0-M91, CSA C22.2 No.94-M91, CSA Std. C22.2
No. 142-M1987, CSA-C22.2 No. 157-92, CSA Std. C22.2 No.
60529 – 2005
Markings Intrinsically Safe Class I, Division 1, Groups A, B, C, and D T3C
(T
a
≤ +60 °C) Type 4X; IP 66/67; when installed per
00781-1011
6.6 Europe
I1 ATEX Intrinsic Safety
Certificate Baseefa11ATEX0059X
Standards EN IEC 60079-0:2018, EN 60079-11: 2012
Markings II 1 G Ex ia IIC T4 Ga, T4(–40 °C ≤ T
a
≤ +70 °C)
Input parameters
(power terminals) Input parameters
(RS485) Output parameters
(RS485)
U
i
= 30 V U
i
= 11 V U
o
= 7.14 V
I
i
= 200 mA I
i
= 300 mA I
o
= 112 mA
P
i
= 1 W P
i
= 1 W P
o
= 1 W
C
i
= 0 μF C
i
= 5.1 nF C
o
= 13.9 μF
Quick Start Guide September 2020
14 Emerson.com/Rosemount