Campbell Manufacturing CR10 *** 63 PARAMETER EXTENSION, SECTION 10. PROCESSING INSTRUCTIONS, ***64 PAROSCIENTIFIC "T" SERIES PROCESSING

PARAM.	DATA
NUMBER	TYPE	DESCRIPTION
01:	4	Source input location
02:	4	Dest. input location
Input locations altered:		1

*** 63 PARAMETER EXTENSION ***

Instruction 63 is used immediately following Instructions 97 or 98 to allow the entry of a variable number of parameters. Instruction 63 can be entered several times in sequence if the number of parameters requires it. There are 8 two digit parameters. Refer to instruction being extended (97, 98) for specifics on the use of Instruction 63.

PARAM.	DATA
NUMBER	TYPE	DESCRIPTION
01:-08:	2	Depends upon preceding
		instruction. Following
		Instruction 97 RF IDs
		and Phone No. 1 digit at
		a time, 32 Between RF
		Ids, 72 Between RF and
		DC112 Phone, and No.
		13 To END. Following
		Instruction 98 (255
		character limit) Base 10
		value of ASCII character
		(Appendix E) 00 TO
		END.
Input locations altered:		0

***64 PAROSCIENTIFIC "T" SERIES PROCESSING ***

FUNCTION

Instruction 64 processes measurements made on the Paroscientific "T" Series pressure transducer. Instruction 105 is in standard PROM OS10-1.1 and OS10-2.1. The transducer outputs a temperature frequency and a pressure frequency. The frequencies are measured using the Period Averaging Instruction, 27, which returns the period of the temperature and pressure signals in microseconds. Instruction 64 converts period to temperature and pressure according to the following relationships provided by Paroscientific.

Pressure (psi) =

C* (1 - T02/Tau2) * (1 - (D * (1 - T02/Tau2)))

Temperature (°C) =

SECTION 10. PROCESSING INSTRUCTIONS

Y1U + Y2U2 + Y3U3

where, C = C1 + C2U + C3U2 (psi),

T0 = T1 + T2U + T3U2 + T4U3 + T5U4 (microsecond),

D= D1 + D2U (microsecond), U = U(t) - U0 (microsecond),

Tau = measured pressure (microsecond), U(t) = measured temperature (microsecond).

Values for the calibration coefficients (U0, Y1,

Y2, Y3, C1, C2, C3, D1, D2, T1, T2, T3, T4, T5) are provided by Paroscientific.

Instruction 64 has two parameters as shown below.

PARAM.	DATA
NUMBER	TYPE	DESCRIPTION
01:	4	Start Loc: Temp(us),
		Pressure(us), U0..T5
02:	4	Start Loc: Temp(oC),
		Pressure(psi), Signature

PARAMETER 1 - Tau, U(t) and 14 coefficients provided by Paroscientific must reside in contiguous input locations starting at the location entered in Parameter 1.

PARAMETER 2 - The results of Instruction 64 (temperature in °C, pressure in psi, and signature of the 14 coefficients) are stored in 3 contiguous input locations starting at the location entered in Parameter 2.

Only the first 5 digits of each 7 digit coefficient are entered in the datalogger. The maximum error that occurs due to using five digit coefficients is 0.001 psi throughout a 15 psi range at any temperature between -30 and +60°C. The maximum error in temperature calculations is 0.2°C over the same temperature range.

Coefficients are entered using CR10 Instruction 30 (Z=F). A calibration sheet from Paroscientific lists the 14 coefficients. Coefficients are entered in the same order as they appear on the calibration sheet. Coefficient U0 is entered first and T5 last. Y3/1000 and D1*1000 are entered for the Y3 and D1 coefficients, respectively. The example below shows the correct format for entering the coefficients.

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