Pressure Systems 9022 Instrukcja Użytkownika Pobierz pdf (Strona 123)

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Measurement Specialties Inc. NetScanner System (9016, 9021, & 9022) User’s Manual

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as it does for Re-zero adjustment, it should be placed in the desired position manually with the

Set Operating Options (‘w’) command (option indexes = 0C and 12). This is illustrated in the

example of the next section.

When multi-point calibrating Model 9016 modules with multiple ranges installed, the CAL port

may be used to apply pressure to all transducers only if the specified proof pressure is not

exceeded on any channel. If the application of a specific span pressure exceeds the proof

pressure rating of any other transducer contained within the same scanner, the calibration

pressures must be applied to the RUN side pneumatic input ports. Since the calibration

command (‘C’) has a channel selection bit map parameter allowing it to calibrate only the desired

pressure channels, the RUN port is a viable option for supplying the calibration pressures.

4.4.2 Multi-Point Calibration Summary

Following is a simple step-by-step procedure for executing a “multi-point” calibration of a 9016,

9021, or 9022 Intelligent Pressure Scanner. For Models 9021 and 9022, skip the steps that

manipulate valves as denoted by the double asterisk (**). It is assumed that all channels in the

unit have the same full-scale pressure range. Optional commands are shown within brackets [ ].

Should it become necessary to abandon this calibration procedure once it is started, you may

execute the Abort sub-command [‘C 03'] of ‘C’ at any time after the first ‘C’ sub-command.

Description

9016

Command

9021/9022

Command

Ensure that valves in RUN/CAL mode (default).

[w1200]

… normal data acquisition assumed to be running

Place the module calibration manifolds into the CAL

position if this is the desired pressure application input.

The RUN position may be a better choice for modules

with transducers having different ranges.

[w0C01]

for CAL

[w0C00]

for RUN

Ready the module for multi-point calibration by

executing the Configure & Start (‘00’) sub-command of

‘C’. This establishes all the channels to be affected, and

determines the total number of calibration points that will

be supplied (3 in this example) in later steps. It also

starts module averaging for calibration (64 samples in this

example). The linear fit (1) is required.

C 00 FFFF 3 1 64 (9016)

C 00 0FFF 3 1 64 (9021/9022)

1 2 ... 118 119 120 121 122 123 124 125 126 127 128 ... 193 194

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