Sensor Accuracy and Field Calibration

The T6615 is a dual channel sensor. The two channels

concentration and a reference channel that measures

the sensor signal intensity. The T6615 performs periodic

self-calibrationsusingthereferencechannel.The

selfcalibrationsareapproximatelyevery24hours

butcanalsobeinitiatedbysendingacommand(see

communicationprotocol).Selfcalibrationsshouldnot

beperformedduringthewarm-upperiod.Duringthe

selfcalibrationthesensorPPMreadingisfrozen,it

adjustablebutnominallytwominutes.

Over time the minor electrical and mechanical changes

can affect the sensor accuracy. With the exception

of operation in harsh environments the rate of signal

change is a decaying function, thus the longer the

sensoroperatesthemorestableitwillbecome.The

reference channel will correct for these changes over

time.Telairerecommendsperiodicgascalibration

depending on the application accuracy requirements.

While the reference channel corrects for changes

overtime,afieldcalibrationusingnitrogengaswill

immediately restore the highest level of accuracy.

Module T6615-F (Flow Through)

Thediffusionmembraneisreplacedwithanon-

permeableseal.Thetwoflowportscanbeused

forflowthroughsampling.Flowrateof50cc/min

recommended.

Handling and Installation

onaprintedcircuitboardandshouldbetreated

carefully.Precautionsshouldbetakentoobserve

specifiedlimitsandpreventdamagefromelectrostatic

dischargeorroughhandling.PleaserefertoANSI/ESD

S20. 20-1999 for more information on preventing ESD

damageandIPC610RevDformoreinformationon

properelectronicassemblypractices.

Available Models

Part

Number

Sampling

Method

Measurement

Range

T6615

Diffusion

0-2,000 ppm

T6615-5K

Diffusion

0-5,000 ppm

T6615-10K

Diffusion

0-10,000 ppm

T6615-50K

Diffusion

0-50,000 ppm

T6615-F

FlowThrough

0-2,000 ppm

T6615-5KF

Flow-through

0-5,000 ppm

T6615-10KF

Flow-through

0-10,000 ppm

T6615-50KF

Flow-through

0-50,000 ppm

T6615-R12

Diffusion, 12 second rate

0-2,000 ppm

Pin Designations

Connector Pinout

Function

A

TX(UART)

B

RX(UART)

C

V+ (5 VDC)

1

V+ (5 VDC)

2

GND

3

GND

4

AVOUT(0to4VDC)

5

No Connect

6

No Connect

7

No Connect

8

No Connect

9

No Connect

10

TX(UART)

11

RX(UART)

12

GND