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Campbell AM25T Instruction Manual

Solid-state thermocouple multiplexer
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AM25T Solid-State
Thermocouple Multiplexer
Revision: 4/17
C o p y r i g h t
©
1 9 9 5 - 2 0 1 7
C a m p b e l l
S c i e n t i f i c ,
I n c .

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Summary of Contents for Campbell AM25T

  • Page 1 AM25T Solid-State Thermocouple Multiplexer Revision: 4/17 C o p y r i g h t © 1 9 9 5 - 2 0 1 7 C a m p b e l l S c i e n t i f i c ,...

  • Page 3: Limited Warranty

    Limited Warranty “Products manufactured by CSI are warranted by CSI to be free from defects in materials and workmanship under normal use and service for twelve months from the date of shipment unless otherwise specified in the corresponding product manual. (Product manuals are available for review online at www.campbellsci.com.) Products not manufactured by CSI, but that are resold by CSI, are warranted only to the limits extended by the original manufacturer.
  • Page 4 (435) 227-9106. Campbell Scientific is unable to process any returns until we receive this form. If the form is not received within three days of product receipt or is incomplete, the product will be returned to the customer at the customer’s expense.
  • Page 5 Periodically (at least yearly) check electrical ground connections. • WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.

  • Page 7: Table Of Contents

    Clock (CLK) ..................3 5. Overview ..............4 6. Specifications ............. 4 7. Installation ..............5 Installing the AM25T ................5 Datalogger to AM25T Wiring .............. 6 Sensor to AM25T Wiring ..............7 7.3.1 Thermocouple Measurement............7 7.3.2 Differential Analog Measurements ..........8 7.3.3...
  • Page 8 Table of Contents B. Example Program ........... B-1 Figures 1-1. AM25T Solid-State Thermocouple Multiplexer ......... 1 5-1. AM25T Solid-State Thermocouple Multiplexer with cover....4 7-1. External Battery Connections .............. 6 7-2. Differential Measurement of Type T Thermocouple ......8 7-3.

  • Page 9: Am25T Solid-State Thermocouple Multiplexer

    AM25T. Single-ended voltage measurements are not recommended. The AM25T must be used in a noncondensing environment. An enclosure is required for field use. In applications where one or two multiplexers are deployed in the field, the ENC12/14 can be used. The ENC16/18 can be used to house several multiplexers at the same site.

  • Page 10: Precautions

    This terminal is used to excite the reference temperature (PRT) on the AM25T. The excitation line is protected from transients with a transorb. (Earlier versions of the AM25T, prior to serial number 1839, used a Zener diode for protection. The diode limited the negative excitation voltage to –400 mV.)

  • Page 11: Power (12V)

    TABLE 7-1. Reset (RES) A control port is used to operate the RES channel. The AM25T is reset and activated by applying and holding 5 Vdc to the RES channel. Once the AM25T is activated, the AM25T reference temperature can be immediately measured.

  • Page 12: Am25T Solid-State Thermocouple Multiplexer With Cover

    AM25T Solid-State Thermocouple Multiplexer Overview The AM25T is housed in an anodized aluminum case with a cover that will help reduce temperature gradients across the AM25T’s terminal strips (FIGURE 5-1). The terminal strips that run the length of the AM25T are for sensor connections.

  • Page 13: Installation

    Campbell Scientific offers weather- resistant enclosures for this purpose. Fasten the AM25T to the enclosure backplate. Securely fasten the leads to the strain relief flange running between the AM25T terminal strips and install the...

  • Page 14: External Battery Connections

    Damage to the multiplexer, sensors, and datalogger will occur. A separate battery can be used to power the AM25T. A separate battery might be used when the AM25T is installed some distance from the datalogger. Ground must be connected between the datalogger and the AM25T (FIGURE 7-1).

  • Page 15: Am25T To Datalogger Wiring

    For example, a one-degree gradient between input terminals and the PRT will result in a one-degree measurement error. The thermal bar in the AM25T, which includes the strain relief, and the AM25T cover are designed to reduce gradients. The PRT is attached to the thermal bar.

  • Page 16: Differential Measurement Of Type T Thermocouple

    Shield Analog Ground Shield Analog Ground is the ⏚ terminal between VX and HI on the AM25T. Analog Ground is the terminal between VX and Hi on the AM25T FIGURE 7-2. Differential Measurement of Type T Thermocouple 7.3.2 Differential Analog Measurements Connect one differential sensor to a differential AM25T input channel.

  • Page 17: Datalogger Programming

    AM25T Solid-State Thermocouple Multiplexer recommends use of Teflon®, polyethylene, or polypropylene insulation around individual conductors. Do not use PVC as conductor insulation. PVC may be used as a cable jacket. With long lead lengths, a delay within the measurement instruction will allow the capacitance of the lead wires to discharge before the measurement is made.

  • Page 18: Crbasic Programming

    Ports Excitation Analog Input Analog Ground is the ⏚ terminal between VX and HI on the AM25T. Analog G round is the terminal between VX and Hi on the AM25T Maintenance Maintain a level of calibration appropriate to the application. Campbell Scientific recommends factory recalibration of the AM25T every five years.

  • Page 19: Short Cut

    Appendix A. Importing Short Cut Code Into CRBasic Editor This tutorial shows: How to import a Short Cut program into a program editor for • additional refinement • How to import a wiring diagram from Short Cut into the comments of a custom program Short Cut creates files, which can be imported into CRBasic Editor.

  • Page 21: Crbasic Example

    Appendix B. Example Program In this example, 25 type T thermocouples are connected to the AM25T. One AM25T() instruction will measure the AM25T’s PRT and the thermocouples. This program is written for the CR6 datalogger. Other CRBasic dataloggers are programmed similarly. TABLE shows the wiring used with the example.
  • Page 22 'Main Scan Scan(5,Sec,0,0) 'Default CR6 Datalogger Battery Voltage measurement 'BattV' Battery(BattV) 'Default CR6 Datalogger Wiring Panel Temperature measurement 'PTemp_C' PanelTemp(PTemp_C,60) 'Type T (copper-constantan) Thermocouple measurements 'Temp_C()' on the AM25T Multiplexer AM25T(Temp_C(),25,mv200C,1,U5,TypeT,RTempC,U1,U2,U3,True,0,60,1,0) 'Call Data Tables and Store Data CallTable Dat15sec CallTable...
  • Page 24 Santo Domingo, Heredia 40305 SOUTH AFRICA COSTA RICA • cleroux@csafrica.co.za • info@campbellsci.cc www.campbellsci.co.za www.campbellsci.cc Campbell Scientific Southeast Asia Co., Ltd. Campbell Scientific Ltd. 877/22 Nirvana@Work, Rama 9 Road Campbell Park Suan Luang Subdistrict, Suan Luang District 80 Hathern Road Bangkok 10250...

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