Digital Control Systems AirSense 310en Operator's Manual

AirSense

Model 310en

Infrared Environmental CO

2

Sensor

Operator's manual

© Copyright 2011

AirSense Model 310en Operator’s Manual

3/9/15 Digital Control Systems Page: i
www.dcs-inc.net • 503/246-8110

Date

10/11/11

3/09/15

Ver01

AirSense Model 310en Operator’s Manual

Table of Contents

Preface......................................................................................... 1

Model Identification..............................................................1

Introduction................................................................................. 1

Displays and Indicators ............................................................... 2

Specifications .............................................................................. 3

Installation................................................................................... 4

Cover Removal .....................................................................4

Mounting...............................................................................4

Wiring...................................................................................5

Power Supply...................................................................5

Signal Output ...................................................................6

Cover Replacement...............................................................7

Field Adjustments........................................................................ 7

High CO2 Limit Adjustment.................................................7

High CO2 Limit Hysteresis Adjustment................................8

Analog Top-of-Scale Adjustment.........................................9

Altitude Correction Considerations .................................... 10

Altitude Correction Procedure .......................................10

Calibration................................................................................. 11

Verification Procedure........................................................11

Optional High Limit Contact Relay .......................................... 13

Setting High Limit Contact Polarity ...................................13

Disclaimers and Notices............................................................ 14

Operational Limitations......................................................14

Safety Critical Applications................................................14

Limited Warranty and Remedies............................................... 14

3/9/15 Digital Control Systems Page: ii

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AirSense Model 310en Operator’s Manual

Preface

This manual describes the Model 310en of the AirSense 310

Carbon Dioxide sensor family. The 310en, while similar in

external appearance and operation to previous 310e models,

has a slightly modified feature set and differences in the

location and operation of the user interface.

Model Identification

Because of its similarity to previous models, the Model

310en is most easily identified by the prefix “M310en” on

the unit’s serial number tag visible on the sensor circuit

board when the cover is removed.

All other AirSense 310e series sensors are covered in the

AirSense Model 310e Operator’s Manual.

Introduction

The AirSense Model 310en is a non-dispersive infrared

analyzer for measuring environmental CO2 concentration in

ventilation systems and indoor living spaces. Its default

measurement range of 0 - 2000 ppm (parts per million; 1000

ppm = 0.1%) covers the range required to monitor

compliance with ASHRAE or other ventilation efficiency

standards. For specialty applications the measurement range

can be easily increased up to 5000 ppm.

Packaged in a compact, distinctively styled enclosure, the

Model 310en can be discreetly installed anywhere from the

board room to the boiler room. Standard center wiring

access, fully floating outputs and power/signal mis-wiring

protection make installation a snap.

The Model 310en provides several output alternatives. A

voltage or 4 - 20 mA current output is standard. An optional

LCD readout is available. An optional relay contact can be

configured to open or close above a user-adjustable setpoint.

3/9/15 Digital Control Systems Page: 1

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AirSense Model 310en Operator’s Manual

Displays and Indicators

The Model 310en has a single green LED on the front panel

which illuminates whenever the unit is operating. This LED

is on steadily when the measured concentration is below the

high CO

2

limit, and blinks whenever the concentration is

above the limit.

The standard factory high CO

2

limit is 1000 ppm, but can be
adjusted in the field. The procedure for adjusting the high
CO

2

limit is described on page 7.

The display option adds a 4 digit liquid crystal display
(LCD) to the front panel. The display shows the measured
CO2 concentration in parts per million (ppm). 1000 parts
per million equals 0.1%.

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AirSense Model 310en Operator’s Manual

Specifications

Operating principle Non-dispersive infrared (NDIR)
Gas sampling method Diffusion or sample draw

Measurement range

400 - 2000 ppm CO

2

(standard)

Field adjustable to 5000 ppm

Typical drift (per year)

±75 ppm (@ 1200ppm)

Accuracy

±5% of reading or ±75 ppm,

Repeatability

±20 ppm
Recommended Calibration Interval Five Years
Response time Less than 1 minute
Operating temperature range

0 to 50 ° C
Operating humidity range 0 - 90% RH (non condensing)
Storage temperature

-30 to + 60 ° C
Power requirements 20 - 28 VRMS AC, 18 - 30 VDC
Power consumption Less than 2W @ 24 VAC
Calibration verification time 10 minutes typical
Dimensions 5.2" x 3.2" x 1.4"
Voltage output (linear) 0 - 10 volts DC
Current output (linear)

4 - 20 mA (R

L

≤ 500Ω)
Warm-up time 3 minutes
Weight 6.5 Oz. (.35 Kg)
Optional Digital Display 4 digit, .35" LCD
Optional setpoint range 0 to full scale
High

Limit

contact polarity jumper selectable

Contact contact rating 2A @ 24 VAC
Operating life expectancy 10 years typical

18 months, parts and labor through
repair or exchange

Warranty

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