Optical Scientific Inc
OFS 2000FW User’s Guide
P/N 1910-901-1
Rev. 03/28/13
4
1.4 Transmitter (TX) Unit
The OFS 2000FW TX Unit, P/N 1910-100-1, consists of two major parts, the housing and the flange adapter.
Figure 1.3 illustrates the major components of the OFS 2000FW TX Unit.
The OFS TX and RX units (with integral spool piece) are designed to mate to an ANSI 150 # 4” flange as is
commonly used in commercial applications. The flange adapter (spool piece) is provided for this purpose. It
also provides thermal isolation from the air flow to be measured and, when supplied with purge air, an air
curtain to help keep the atmosphere in the mounting nozzles clear and the windows clean.
The transmitter housing contains the transmitter optical assembly and transmitter driver circuit board. The
optical assembly is pre-aligned in the factory and needs no focusing, just aiming. The LED (transmitter optical
module) aim is adjustable to ensure the eye-safe red light beam properly illuminates the detectors in the RX
Unit.
The transmitter driver circuit board contains a universal (100 - 240 VAC) power supply, 1A, 250V, 3AG fuse,
and modulation & drive circuitry for the light source.
Two indicator LEDs are provided on the PCB to indicate correct operation of the TX Unit:
a red LED is ON when AC power is supplied.
a green LED is ON when the transmitter red LED is operating with the proper modulation.
A user-supplied AC power cable connects to the three position terminal block on the PCB. [See Section 3.7
“AC Power Connections”]
Figure 1.3 OFS 2000FW Transmitter
