Veris Industries CW SERIES Install - Manual (Page 4)

Z204903-0M PAGE 4 ©2011 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected] 06114
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TM
CW SERIES INSTALLATION GUIDE
ABC CALIBRATION ALGORITHM
ABC (Automatic Baseline Calibration) is a patented self-calibration feature that
automatically adjusts the CO
2
sensor to compensate for drift. When ABC is enabled,
the sensor records the lowest reading within every 24-hour interval and compares
these values over a running 7-day or 28-day period. If a statistically significant
amount of drift is detected, the ABC applies an automatic correction factor. This
enables the sensor to operate within specifications for the 5-year calibration interval.
ON POSITION. Recommended Setting. Use the ON setting for applications where the
building is unoccupied within a 24-hour timeframe.
LOW POSITION. Use the LOW setting for buildings occupied 24 hours a day.
OFF POSITION. Not Recommended.
NOTE: After changing the ABC settings, power cycle the unit for changes to take effect.
To set the ABC mode for CWL models, refer to the Configuration section on page 4.
To set the ABC mode for CWE models, position the ABC jumper as shown:
ON LOW
ABC Settings (CWE only)
OFF
ON
LOW
OFF
ON
LOW
OFF
ON
LOW
OFF
OUTPUT SCALING
CO2 - Carbon Dioxide Sensor
Output scaling: 0-2000ppm
CO
2
PPM 0-5 V Output 0-10 V Output mA
Output
Outside 300-500 0.75 to 1.25 1.5 to 2.5 6.4 to 8
Over Ventilated Under 600 under 1.5 Under 3 Under 8.8
Ideal Ventilation 600-900 1.5 to 2.25 3 to 4.5 8.8 to 11.2
Under Ventilated Over 900 over 2.25 Over 4.5 Over 11.2
RH - Relative Humidity Sensor
Output scaling: 0-100%
T - Temperature Transmitter
Output scaling: 10° to 35°C (50° to 95°F)
To determine temperature from output reading:
1. Compute Total Span from Temperature Range:
Maximum range - Minimum range = Total span
ex. 10° to 35°C range: 35 - 10 = 25 Total span
2. Compute Output % of Span from Reading:
(Reading - Minimum Output) / (Maximum output - Minimum output)
ex. 11.10 mA reading on 4-20 mA output: (11.10-4) / (20-4) = 7.10 / 16 =
0.444 = 44.4%
ex. 4.44v reading on 0-10 V output: (4.44-0) / (10-0) = 4.44 / 10 = 0.444 =
44.4%
3. Compute Temperature:
(Total span x Output % of Span) + Minimum range
ex. 44.4% Output, Total Span = 45, range = 50/95: (0.444 x 45) + 50 = 20 +
50 = 70°
Example outputs for selected temperatures:
Temp 4-20 mA 0-10 V 0-5 V
65 9.33 mA 3.33 V 1.67 V
70 11.10 mA 4.44 V 2.22 V
75 12.89 mA 5.56 V 2.78 V