Chemtrac Auto Clean UV254, Owner'S Manual, Page: 38 / 41

Chemtrac UV254 Monitor
– UVM5000 v 2.1
Chemtrac, Inc. 37
15.3.1
Lamp Numbers
Lamp numbers are not affected by sample water absorbance as they are a direct reading of the lamp output.
CONDITION VALUE ISSUE / ACTION
Values fluctuate more than 20
points after monitor has warmed
up.
Fluctuating Problem with lamp or lamp sensor.
Current lamp may be brighter
than previous one.
4,000 and higher
Change lamp or wait for a 14-day burn-in period to
see if lamp value falls below 4,000.
Lamp Low alarm appears. 1000 - 1500 Replace lamp.
New lamp Significantly lower than 1,500
Lamp may be faulty; possibly damaged during
shipping.
15.3.2
Water Numbers
Water numbers are dependent on the absorbance of the sample water stream.
CONDITION VALUE ISSUE / ACTION
Lamp values within range. Less than 100
Sample is close to the bottom of the measurement
range OR flow cell needs to be cleaned.
DI water in flow cell
Difference between Water 1
and Water 2 is greater than
100 points.
Flow cell has been fouled or has scaling and should
be cleaned.
15.3.3
Temperature and Humidity
The internal temperature should be kept below 50 degrees Celsius. The system will alarm if this temperature is
reached. If this happens, it may indicate the monitor should be moved to a shaded or cooler location.
Humidity should be kept as low as possible especially when the sample water is cold as condensation can form
on the flow cell which can severely affect accuracy. Please refer to the Dehumidifier section of this manual.