Campbell Scientific CR10 CR10 Measurement and Control - Page 149

SECT]ON 10. PROCESSING INSTRUCTIONS PARAM. DATA NUMBER TYPE DESCRIPTION 01: 4 Source input location 02: 4 Dest. input location Input locations altered: 1 *** 63 PARAMETER EXTENSION '*T*' Instruction 63 is used immediately following Instructions 97 or 98 to allow the entry of a variable number of parameters. lnstruction 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 lnstruction 63. PARAM. DATA NUMBER TYPE DESCRIPTION 01:-08: 2 Depends upon preceding instruction. Following lnstruction 97 RF lDs and Phone No. 1 digit at a time, 32 Between RF lds, 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. lnput locations altered: 0 *** 64 PAROSCIENTIFIC "T'SERIES PROCESSING *** FUNCTION Instruction 64 processes measurements made on the Paroscientific "T" Series pressure transducer. lnstruction 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 (psl) = C " (1 - TozfTauz). (1 - (D " (1 - TozlTau2))) Temperature ('C) = Y1U+Y2U2+Y3U3 where, C= Cr + C2U +CaU2 (psi), To = Tr + T2U + T3U2 + TaUs + T5Ua (microsecond), D = Dr + D2U (microsecond), g = U(t) - Us (microsecond), Tau = measured pressure (microsecond), U(t) = ms.tured temperature (microsecond). Values for the calibration coetficients (Us, Y1, Y2, Y3, C1, C2, C3, D1, D2, T1 , T2,Tg, Ta, T5) are provided by Paroscientific. Instruction 64 has two parameters as shown below. PARAM. NUMBER TDAYTAPE 01: 4 O2: 4 DESCRIPTION Stail Loc: Temp(us), Pressure(us), U0..T5 Start Loc: Temp(oO), Pressure(psi), Signatu re 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 lnstruction 64 (temperature in oC, 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 coetficients 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=FI. A calibration sheet from Paroscientific lists the 14 coefficients. Coefficients are entered in the same order as they appear on the calibration sheet. Coefficient Ue is entered first and Tu last. Ys/l000 and D1.1000 are entered for the Y3 and D1 coefficients, respectively. The example below shows the correct format for entering the coefficients. Example: The 14 coefficients shown below are for Paroscientific "T" Series transducer Serial Number 30135. Your coefficients will be different. 10-7