Particle Measuring Systems LASAIR II 550L Operator's Manual

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Page Page J-6 J-6 LASAIR LASAIR II II Operator’s Operator’s ManualManual
Appendix J: 4-20 mA Input and OutputAppendix J: 4-20 mA Input and Output
4–20 mA Out Status Channel4–20 mA Out Status Channel
Channel 1 can be used to monitor the following information:Channel 1 can be used to monitor the following information:
•• Power On/OffPower On/Off
•• Sampling/IdleSampling/Idle
•• Laser ErrorLaser Error
••
Pump ErrorPump Error
•• Particle AlarmParticle Alarm
4-20 mA Out Particle Channel4-20 mA Out Particle Channel
The status channel can be examined either as a single level check, or as bitThe status channel can be examined either as a single level check, or as bit
mapped error bits. In the simplest test, the output will be 18.25 mapped error bits. In the simplest test, the output will be 18.25 mA if the box ismA if the box is
on, no alarms are set, and on, no alarms are set, and sampling is taking place. If something is wrong, thesampling is taking place. If something is wrong, the
output will be 17.5 mA or less.output will be 17.5 mA or less.
A more complex decoding is a combination of level sensitive and bitmap. If theA more complex decoding is a combination of level sensitive and bitmap. If the
LASAIR II is on, a base level of LASAIR II is on, a base level of 7 7 mA is output. If the LASAIR II is off, thenmA is output. If the LASAIR II is off, then
the output current will be less than 7 mA.the output current will be less than 7 mA.
The status parameters are bit encoded with 0.75 The status parameters are bit encoded with 0.75 mA per bit, and the bits aremA per bit, and the bits are
assigned as follows:assigned as follows:
Manifold PositionManifold Position
The manifold position is output at 4 The manifold position is output at 4 mA if the AM-II is not being used. If it ismA if the AM-II is not being used. If it is
used, then each channel is 0.25 mA. Thus channel 1 is 4.25 mA, and channelused, then each channel is 0.25 mA. Thus channel 1 is 4.25 mA, and channel
32 is 12 mA.32 is 12 mA.
Notes on Setting Particle Scale FactorsNotes on Setting Particle Scale Factors
Channel Particle Scale ConsiderationsChannel Particle Scale Considerations
The maximum counts that can be monitored is the same as the scale factor. InThe maximum counts that can be monitored is the same as the scale factor. In
other words, if the scale for channel 1 other words, if the scale for channel 1 is set to 100, then the is set to 100, then the output will be 20output will be 20
mA, when the counts read 100. If the counts are 105, or 2000, the output willmA, when the counts read 100. If the counts are 105, or 2000, the output will
stilstill be 20 l be 20 mA.mA.
SaSammplplining_g_onon bibit t 1 1 = = 0.0.75 m75 mAA
PPuummppOOKK bbiit t 2 2 = = 11..5 5 mmAA
LLaasseerrOOKK bbiit t 3 3 = = 33..0 0 mmAA
Particle Not Alarmed bit 4 = 6.0 mAParticle Not Alarmed bit 4 = 6.0 mA
When LASAIR II is on, the base-level output is 7 mAWhen LASAIR II is on, the base-level output is 7 mA

Particle Measuring Systems LASAIR II 550L Specifications

General

Brand	Particle Measuring Systems
Model	LASAIR II 550L
Category	Measuring Instruments
Language	English