Metal Samples MS2701E, Operator'S Manual, Page: 9 / 25

7
The maximum permissible length of the field wiring between the MS2701E transmitter and the
control system is determined by the control system supply voltage, the electrical resistance of the
cable and the load of the control system input. If the Transmitter is to be installed in a safe area, refer
to section c. Safe Area Installation for details. If the Transmitter is to be installed in a hazardous area,
refer to section d. Hazardous Area Installation .
b. Grounding
The MS2701E transmitter enclosure is grounded internally through the wiring harness, but an
additional, external grounding terminal is provided as well. The enclosure should be grounded
properly using the external grounding terminal to ensure safe operation.
c. Safe Area Installation
The MS2701E transmitter is approved for use in hazardous areas, but can be used in non ‐ hazardous
areas as well. For basic safe area wiring information refer to the circuit diagram shown on page 21.
CAUTION:
When used in non ‐ hazardous areas, equipment must be supplied with a pre ‐ approved power
supply unit or approved equipment which meets the entity parameters shown below.
The pre ‐ approved equipment must be certified to the electrical safety standards for equipment in
ordinary locations (for example, EN/IEC/CSA UL 61010 ‐ 1 or EN/IEC/CSA UL 60950 ‐ 1). Failure to meet
these requirements will void the intrinsic safety certification of the equipment and prohibit its future
use in hazardous areas.
d. Hazardous Area Installation
CAUTION:
This section provides general guidelines for hazardous area wiring. However, regardless of
anything stated here, the MS2701E transmitter must be installed in full compliance with the control
drawing located on page 20 and all of the local area requirements.
CAUTION:
When used in Hazardous areas, equipment must be supplied with a pre ‐ approved power
supply unit or approved equipment via a certified intrinsically safe barrier or a galvanically isolated
barrier) with the following entity parameters .
Input supply terminal RS-485 channel CN1 and connector CN2 (Combined)
Connector CN1 pins A & B (J2 on PCB): Ci = 68uF
Ui = 23.6 Vdc Li = 0
Ii = 352.8 mA Co = 32uF
Pi = 2.3 W Lo = 1.2 mH
Ci = 0
Li = 0 Input supply terminal, RS-485 terminal
and connector CN2 (combined)
RS-485 channel at each line Ui = 23 Vdc
Connector CN1 pins D & E (J9 on PCB): Ii = 538 mA
Ui = 3.7 Vdc Pi = 0.7 W
Ii = 225 mA Ci = 68uF
Pi = 0.206 W Li = 0
U
o
= 5 V
Co = 32uF
I
o
= 51 mA Lo = 0.14 mH
P
o
= 64 mW