Rev: 08/01
3.0
Wait for reading to stabilize (capacitors cause readings to slightly lag)
4.0
Repeat steps 2 and 3 until meter reading is stable
5.0
Apply the NO
2
via the regulator to NO
2
sensor adapter cap
a. Set meter for 20V range while applying gas
6.0
Wait for the meter reading and display to start rising (this may take several minutes). Voltage reading is for
stability and reference only
7.0
Start adjusting the RA4 Gain 1M
Ω
multi-turn pot, when voltage stabilizes
a.
Adjust until the unit Display reading matches the mixture being used (5.0ppm)
b.
To increase voltage and display reading turn Gain pot clockwise
c.
Wait until display and voltage readings stabilize, then set the milliamp output to 17.33 mA for 5ppm via
RA1
d.
Remove gas
8.0
Reading should begin to drop towards zero (a slight increase may take place when gas is first removed, this is
normal)
9.0
Wait at least 1 hour, then repeat steps 2 thru 7 until Zero=0.00V, 4mA output (+/-0.06V) and Gain =gas mixture
on display including the correct milliamp output (step 7C)
10.0
When finished disassemble canister and regulator
