Chapter 5 Operation; Open Path System Operation; Power Up - Emerson Rosemount 935 Reference Manual

Reference Manual
00809-0100-4035
5 Operation
5.1

Open path system operation

Once the system is positioned, it monitors for possible specified gases, automatically
sending signals to a standard control panel or a personal computer (PC).
This section describes calibration and operation.
NOTICE
Accurate alignment is essential for proper operation of the open path system.
Related information
Installation
5.2

Power up

Prerequisites
WARNING
All individuals who have or will have responsibility for using, maintaining, or servicing this
product must read this manual thoroughly.
NOTICE
Disconnect external devices, such as fire alarms and automatic extinguishing systems,
before performing maintenance.
Procedure
1. Ensure that the source and detector are connected to power.
2. Ensure that the 4-20 mA wiring meter is connected to the detector.
3. Power up the system 18 to 32 Vdc.
Postrequisites
After powering up, zero calibrate the system.
Rosemount 935
After sixty seconds, the current meter indicates 4 mA.
Operation
May 2022
39