Hpppp, Gggg .. g.gggg, Description | Pressure Systems 9022 guide

Pressure Systems, Inc.

NetScanner™ System (9016, 9021, & 9022) User’s Manual

CALCULATE AND SET OFFSETS (Command ‘h’)

Purpose:	Instructs a module to calculate new offset coefficients with zero differential pressure
	(or a specified “generated” pressure) applied to the specified channels. These new
	coefficients update part of the module’s internal calibration coefficient database,
	used to convert any subsequent raw data into engineering units data. The new
	offset values are also returned in the response. This command is sometimes called
	a Re-zero or zero-only calibration.
Command	“hpppp [vv.vvvv]”
	‘h’ is the command letter
	‘pppp’ is the position field
	‘vv.vvvv’ is an [optional] applied pressure value preceded by a space
	character
Response	“g.gggg .. [g.gggg]...”
	‘g.gggg’ are the actual offset data values returned, each preceded by a space.
Description:	The position field may have 0 or 4 characters. If no position field is specified,
	offset coefficients for all of a module’s input channels will be calculated and
	returned. If a position field is specified, offset coefficients for only the channels
	whose bits are set (=1) will be calculated and returned. If the optional pressure value
	[ vv.vvvv] is specified, the position field must be 4 characters, even when all
	channels are to be specified. If the optional pressure value [‘vv.vvv’] is not
	provided, an applied pressure of 0.0 psi(a) will be assumed when calculating
	coefficients. When using the 9021/9022 module with 9401 absolute pressure
	transducers, it will usually be required to use the applied pressure field [‘vv.vvv’] as
	it may not be possible to apply 0.0 psia to the 9401 transducers. Offset values are
	returned in the response in order of highest specified channel to lowest specified
	channel, with data formatted per an implied decimal format (f=0).
	Before acquiring data with this command, any addressed Model 9016 module will
	normally attempt to place the calibration valve in the CAL position, so that a zero
	differential pressure can be applied to all channels via the module’s CAL and CAL
	Ref input port. Simply leaving these ports unattached will allow the transducers to
	read the appropriate zero differential pressure if ambient air pressure is stable. After
	data are acquired, the calibration valve will be placed in the RUN position. To
	disable the automatic shifting of the calibration valve, refer to the Set Operating
	Options (‘w’) command (index 0B). The reader is also referred to Section 4.2 of

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9022 specifications

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Pressure Systems 9022 Calculate and SET Offsets Command ‘h’ Purpose, Hpppp, Gggg .. g.gggg

Models: 9022

CALCULATE AND SET OFFSETS (Command ‘h’)

Purpose:

Command

“hpppp [vv.vvvv]”

“g.gggg .. [g.gggg]...”

Description:

9022 specifications