C T I O N; Using The On Line Zero Reflector (Option); Procedure; Filter Correction - EMS 1304 Installation And Operation Manual

Section 6

USING THE ON LINE ZERO REFLECTOR (OPTION)

The "Micro-turn" 200 on - line test and audit system P/N 1232 may be used for:
 Opacity audit
 Linearity checks and adjustments
 System accuracy verification
 Service on line or off stack
The "Micro-turn" 200 on - line test and audit system P/N 1232 contains a test reflector, three neutral density
filters, filter certification certificates and carrying case. The Micro-turn 200 on-line test reflector is inserted over the
transceiver lens.

Procedure

The Micro-turn 200 on-line test reflector is inserted over the transceiver lens. The filters provided are marked in
single-pass opacity, this is the same as double-pass with a correlation factor (OPLR) of "0.50" for other correlation
factors turn to CHANGING OPLR section for instructions.
Hold the Micro-turn in a position so as to see the reflector. Turn the fine adjustment (large knob) in a
1.
direction, which will open the iris to expose more of the reflector. This direction will cause the
monitor to lower opacity and by turning in the opposite direction, closing the iris, will raise the
opacity.
Loosen clamps on the transceiver and swing it open and
2.
clean the lens, use alcohol with a clean lint free paper and
leave no film on the lens.
Place the Micro-Turn 200 with the reflector facing
3.
toward the Transmissometer (away from the stack) on
the two alignment pins and screw the device to the
transceiver with the mounting screw.
Using the fine adjustment (large knob) start by raising the
4.
opacity level above zero, and then slowly turn the knob in
the opposite direction to just reach "ZERO". If you
cannot reach zero or you cannot come above zero see
"course" adjustment section of this manual.
Place the EMS Neutral Density Slides in the slot provided
5.
device just behind the mounting screw. The system should
value written on the label +/- 2% or better.

Filter correction

If you have an OPLR (correlation factor) other than 0.5 your slides will read differently. To calculate what the slide
will read with another OPLR use the formula:
Mounting screw
Reflector plate
Figure 5, Micro-Turn 200
33
Large Knob
on the top of the
read the same