Preparing Conduit Openings; Preparing Sensor Cable; Power, Output And Sensor Connections - Emerson Rosemount 1057 Instruction Manual

Section 3: Wiring
April 2017
3.2

Preparing Conduit Openings

There are six conduit openings in all configurations of Model 1057. (Note that four plugs are provided
upon shipment.)
Note: Use watertight fittings and hubs that comply with your requirements. Connect the conduit
hub to the conduit before attaching the fitting to the analyzer.
3.3

Preparing Sensor Cable

The Model 1057 is intended for use with all Rosemount pH/ORP and contacting
conductivity sensors. Refer to the sensor installation instructions for details on preparing
sensor cables.
3.4

Power, Output and Sensor Connections

All field wiring must be rated for 75 °C or higher. Each instrument includes a printed label inside the
enclosure stating this wiring requirement.
3.4.1 Power Wiring
Two Power Supplies are offered for Model 1057:
a. 24 Vdc (20 – 30V) Power Supply (-02 ordering code)
b. 84 – 265 Vac Switching Power Supply (-03 ordering code)
AC mains (115 or 230V) leads and 24 Vdc leads are wired to the Power Supply board which is mounted
vertically on the left side of the main enclosure cavity. Each lead location is clearly marked on the
Power Supply board. Wire the power leads to the Power Supply board using the lead markings on
the board.
Figure 3-2 24 Vdc Power Supply (-02 ordering code)
Figure 3-3 Switching AC Power Supply (-03 ordering code)
12
This power supply automatically detects DC
power and accepts 20 Vdc to 30 Vdc inputs.
Four programmable alarm relays are included.
This power supply automatically detects AC line
conditions and switches to the proper line volt-
age and line frequency.
Four programmable alarm relays are included.
Instruction Manual
LIQ-MAN-1057
Section 3: Wiring