Description - Emerson Rosemount 935 Reference Manual

Technical description
May 2023
Table 3-2: Model numbers and installation distances
Model
number
935
935
935
935
3.6

Description

The Rosemount 935 is comprised of 2 main units:
• The Flash Infrared Transmitter
• The Infrared Receiver
3.6.1 Transmitter unit
The transmitter unit emits a powerful IR pulse (5-10ms width) at the rate of 2 pulses
per second. The front of the transmitter unit has a lens that collimates the IR beam
for maximum intensity. The front window is heated to improve performance in ice,
condensation, and snow conditions.
Figure 3-1: Transmitter
A. Front window section
B. Label
C. Main housing
D. Mounting plate
E. Indicator LED
F. Back cover
G. Earth terminal
H. Front window
I. Inlet conduit
J. Inlet conduit
14
Source Minimum installation
distance
T1 23 ft (7 m)
T2 50 ft (15 m)
T3 115 ft (35 m)
T4 265 ft (81 m)
Reference Manual
00809-0100-4035
Maximum installation
distance
66 ft (20 m)
132 ft (40 m)
330 ft (101 m)
656 ft (201 m)
Emerson.com/Rosemount