Chapter 7 Operating Instructions; Safety Operation; Alignment Of Unit - Emerson Rosemount 935 Reference Manual

Reference Manual
00809-0100-4035
7 Operating instructions
For information on communicating with the device, see the principles of operation topics.
7.1

Safety operation

Once the system is in place, it automatically monitors for the specified gases, and sends
signals to a standard control panel or PC. This section describes the alignment, calibration,
and operation of the Rosemount 935 System.
CAUTION
Accurate alignment is essential for proper operation of the Rosemount 935 system.
7.2

Alignment of unit

The alignment tool is used to perform full alignment.
Perform the alignment procedure in 2 stages: crude alignment and fine adjustment.
The alignment tool includes a periscope that consists of a prism and an ocular that are
located vertical to the alignment tool assembly. This allows the user to look into the
opposite unit perpendicularly to the one being aligned, when access from the rear of
the unit is impossible. For installations where rear access is possible, the periscope is not
necessary, and it can be removed by releasing the periscope fastening screw.
Note
• To ensure proper alignment according to factory calibration, prior to alignment tool
installation, verify that the alignment tool and its sight mounting are free of dirt.
• To ensure optimal alignment, do not attempt to change factory calibration of the
alignment tool or its mounting.
To align the unit (see
Procedure
1. Ensure that the receiver and the are installed properly refer to
2. Remove the front shield using the 2 captive screws.
3. Install the alignment tool assembly (Item L) on the front of the receiver or
4. Crude Alignment:
Rosemount 935
Figure 6-2):
instructions.
transmitter. Fasten the alignment tool with fastening screws (Item M).
a. Use a ¼-in. Allen screwdriver for all alignment screws.
b. Loosen screws E and F.
c. Approximately aim the transmitter horizontally toward the receiver.
d. Tighten screw F.
e. Loosen screws C and D.
f. Approximately aim the transmitter vertically toward the receiver.
Operating instructions
May 2023
Installation
39