Campbell Scientific CR10 CR10 Measurement and Control - Page 131

SECTION 9. INPUT/OUTPUT INSTRUCTIONS Code X1 x2 X3 x4 TABLE 9-3. Thermocouple Type Codes Thermocouple Tvpe T (copper - constantan) E (chromel - constantan) K (chromel- alumel) J (iron - constantan) X=0 X=8 X=9 Normal Measurement TC input from A5B40 isolation (uses 5 V range) Output -99999 if out of common mode range (lnst. 14 only) TABLE 9-4. Voltage and Temperature Ranges for Thermocouples if the Reference is 20oC Voltage Range t2.5 mV t7.5 mV t25 mV 1250 mV Type T -46 to 50 -270 to 181 -270 to 400 Type E -21 to 60 -124to 134 -270 to 365 -270 to 1000 Type K -44 to 80 -270lo 620 -27Oto 620 -270ro 1372 Type J -29 to 67 -149 to 159 -2101o 476 -210 to 760 PARAM. NUMBER TDAYTAPE 01: 2 02: 2 03: 2 Q4: 2 05: 4 06: 4 07: 08: FFPP DESCRIPTION Repetitions Range code fiable 9-4) Single-ended channel number for first TC Thermocouple type code Reference temperature location Destination input location Multiplier Offset Input locations altered: 1 for each thermocouple channel *** 14 THERMOCOUPLE TEMPERATURE, *** DIFFERENTIAL MEASUREMENT FUNCTION This instruction calculates the thermocouple temperature for the thermocouple type selected. The instruction specifies a DIFFERENTIAL VOLTAGE MEASUREMENT (Section 13.2) on the thermocouple, adds the measured voltage to the voltage calculated for the reference temperature relative to 0"C, and converts the combined voltage to temperature in "C. The ditferential inputs are briefly shoded to ground prior to making the voltage measurement to insure that they are within the common mode range. Table 9-3 gives the thermocouple type codes for Parameter 4. Enter a 9 in front of the code and the CR10 will make an additional check on common mode range; -99999 is output for temperature if common mode range is exceeded. PARAM. DATA NUMBER TYPE 01: 2 02: 2 03: 2 04: 2 05: 4 06: 4 07: 08: FP FP DESCRIPTION Repetitions Range code (Table 9-1) Differentialchannel number for first TC Thermocouple type code Reference temperature location Destination input location Multiplier Offset Input locations altered: 1 for each thermocouple channel *** 16 TEMPERATURE FROM *** PLATINUM R.T.D. FUNCTION This instruction uses the result of a previous RTD bridge measurement to calculate the temperature according to the DIN 43760 specification adjusted (1980) to conform to the International Electrotechnical Commission standard. The range of linearization is -200'to 850'C. The error in the linearization is less than 0.001'C between -100'and +300"C, and is less than 0.003"C between -180'and +830'C. The error (T calculated - T standard) is +0.006'at 200"C and -0.006'at +850"C. The input must be the ratio Rs/Ro, where Rs is the RTD