Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1 Manuel d'utilisateur télécharger pdf (Page 36)

EC155 CO

and H

O Closed-Path Gas Analyzer

The following block of code is an example implementation of Campbell

Scientific’s signature algorithm in the programming language C. To generate

the signature of an output array of bytes, the seed needs to be initialized to

0xaaaa and a pointer passed to the first byte of the output array. The number of

bytes in the output array should be entered in as the swath. The returned value

is the computed signature.

//signature(), signature algorithm.

// Standard signature is initialized with a seed of 0xaaaa.

// Returns signature.

unsigned short signature( unsigned char* buf, int swath,

unsigned short seed ) {

unsigned char msb, lsb;

unsigned char b;

int i;

msb = seed >> 8;

lsb = seed;

for( i = 0; i < swath; i++ ) {

b = (lsb << 1) + msb + *buf++;

if( lsb & 0x80 ) b++;

msb = lsb;

lsb = b;

}

return (unsigned short)((msb << 8) + lsb);

}

8.3 Analog Outputs

If analog output is enabled, the EC100 will output two analog signals that

correspond to CO

density and H

O density. These signals range from 0 to +5

Volts. TABLE 8-2 below gives the multipliers and offsets for the analog

outputs.

TABLE 8-2. Multipliers and Offsets for Analog Outputs

Mixing Ratio

(µmol mol

-1

)

Voltage Output Multiplier

(µmol mol

-1

)

Offset

(µmol mol

-1

)

211.27

-56.34

11.31

-3.04

9. Maintenance

There are five basic types of maintenance for the EC155/EC100: intake filter

replacement (if EC155 was ordered with an intake), analyzer window cleaning,

zero and spanning, replacing analyzer desiccant/scrubber bottles, and factory

recalibration.

9.1 Routine Maintenance

The following items should be examined periodically:

• Check the humidity indicator card in the EC100 enclosure. If the highest

dot has turned pink, replace or recharge the desiccant bags. Replacement

desiccant bags may be purchased (pn 6714), or old ones may be recharged

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Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1 Manuel d'utilisateur Page 36

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