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Safety 

DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND 

TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, 

ANTENNAS, ETC

. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, 

TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS 

INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS. 

CHECK WITH YOUR ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE 

EQUIPMENT PRIOR TO PERFORMING ANY WORK. 

Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not exceed design limits. 

Be familiar and comply with all instructions provided in product manuals. Manuals are available at www.campbellsci.com or by 

telephoning (435) 227-9000 (USA). You are responsible for conformance with governing codes and regulations, including safety 

regulations, and the integrity and location of structures or land to which towers, tripods, and any attachments are attached. Installation 

sites should be evaluated and approved by a qualified engineer. If questions or concerns arise regarding installation, use, or 

maintenance of tripods, towers, attachments, or electrical connections, consult with a licensed and qualified engineer or electrician. 
General 

 

Prior to performing site or installation work, obtain required approvals and permits. Comply 

with all governing structure-height regulations, such as those of the FAA in the USA. 

 

Use only qualified personnel for installation, use, and maintenance of tripods and towers, and 

any attachments to tripods and towers. The use of licensed and qualified contractors is highly 

recommended. 

 

Read all applicable instructions carefully and understand procedures thoroughly before 

beginning work. 

 

Wear a

 hardhat 

and

 eye protection

, and take 

other appropriate safety precautions

 while 

working on or around tripods and towers.

 

 

Do not climb

 tripods or towers at any time, and prohibit climbing by other persons. Take 

reasonable precautions to secure tripod and tower sites from trespassers. 

 

Use only manufacturer recommended parts, materials, and tools. 

Utility and Electrical 

 

You can be killed

 or sustain serious bodily injury if the tripod, tower, or attachments you are 

installing, constructing, using, or maintaining, or a tool, stake, or anchor, come in 

contact with

 

overhead or underground utility lines

 

Maintain a distance of at least one-and-one-half times structure height, 20 feet, or the distance 

required by applicable law, 

whichever is greater

, between overhead utility lines and the 

structure (tripod, tower, attachments, or tools). 

 

Prior to performing site or installation work, inform all utility companies and have all 

underground utilities marked. 

 

Comply with all electrical codes. Electrical equipment and related grounding devices should be 

installed by a licensed and qualified electrician. 

Elevated Work and Weather 

 

Exercise extreme caution when performing elevated work. 

 

Use appropriate equipment and safety practices. 

 

During installation and maintenance, keep tower and tripod sites clear of un-trained or non-

essential personnel. Take precautions to prevent elevated tools and objects from dropping. 

 

Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc. 

Maintenance 

 

Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks, 

frayed cables, loose cable clamps, cable tightness, etc. and take necessary corrective actions. 

 

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. 

 

Summary of Contents for AM25T

Page 1: ...INSTRUCTION MANUAL 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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Page 3: ...ducts to CSI CSI will return such Products by surface carrier prepaid within the continental United States of America To all other locations CSI will return such Products best way CIP port of entry per Incoterms 2010 This warranty shall not apply to any Products which have been subjected to modification misuse neglect improper service accidents of nature or shipping damage This warranty is in lieu...

Page 4: ... address is CAMPBELL SCIENTIFIC INC RMA _____ 815 West 1800 North Logan Utah 84321 1784 For all returns the customer must fill out a Statement of Product Cleanliness and Decontamination form and comply with the requirements specified in it The form is available from our website at www campbellsci com repair A completed form must be either emailed to repair campbellsci com or faxed to 435 227 9106 ...

Page 5: ...e beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers Use only manufacturer recommended parts materials and tools Utility and Electrical You can be kil...

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Page 7: ...r Ground G Ground Terminals 3 4 5 Analog Ground 3 4 6 Reset RES 3 4 7 Clock CLK 3 5 Overview 4 6 Specifications 4 7 Installation 5 7 1 Installing the AM25T 5 7 2 Datalogger to AM25T Wiring 6 7 3 Sensor to AM25T Wiring 7 7 3 1 Thermocouple Measurement 7 7 3 2 Differential Analog Measurements 8 7 3 3 Mixed Sensor Types 8 8 Operation 8 8 1 General Measurement Considerations 8 8 2 Datalogger Programmi...

Page 8: ...uple Multiplexer with cover 4 7 1 External Battery Connections 6 7 2 Differential Measurement of Type T Thermocouple 8 7 3 Differential Voltage Measurement 8 8 1 Short Cut 9 Tables 7 1 AM25T to Datalogger Wiring 7 CRBasic Example B 1 CR6 Program Using One Instruction to Measure Both the Reference Temperature and Thermocouples B 1 ...

Page 9: ...suitable for resistive bridge measurements high impedance of the solid state relays or multiplexing power 25 mA maximum switching current A maximum of 25 thermocouples differential voltage measurement can be multiplexed by an 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...

Page 10: ...ing material for product that may be concealed Check model number part numbers and product descriptions against the shipping documents Model or part numbers are found on each product On cables the number is often found at the end of the cable that connects to the measurement device Ensure that the expected lengths of cables were received Contact Campbell Scientific immediately if there are any dis...

Page 11: ... the terminal located between the VX and HI terminals Analog ground is not common with the other ground terminals labeled The analog ground terminal must be connected to the datalogger ground as shown in TABLE 7 1 4 6 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 re...

Page 12: ...ad wires up to 1 5 mm 0 059 inches in diameter A strain relief flange is located between the input terminals FIGURE 5 1 AM25T Solid State Thermocouple Multiplexer with cover 6 Specifications Power Unregulated 9 6 to 16 Vdc 12 Vdc nominal Current Drain Quiescent 0 5 mA Active 1 0 mA typical Enable Inactive 0 9 V Active 3 5 to 5 0 V 7 V max Clock The relays are advanced on the falling edge of the cl...

Page 13: ...um Switching Current 25 mA switching currents greater than 25 mA will damage the relays and render them unusable Compliance View the EU Declaration of Conformity at www campbellsci com am25t Assumes sequential activation of multiplexers and that each datalogger channel is uniquely dedicated If your application requires additional multiplexing capability please consult Campbell Scientific for appli...

Page 14: ...parate 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 FIGURE 7 1 External Battery Connections When leads in excess of 152 m 500 feet are used to connect the datalogger to the AM25T it may be necessary to compensate for the drop in PRT excitation voltage All AM25T inputs are spark gap prote...

Page 15: ...datalogger input to measure the reference Thermal gradients between the AM25T sensor input terminals and the PRT cause errors in thermocouple readings 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 attache...

Page 16: ...r Types Different sensors may be mixed on the AM25T Additional loops and measurement instructions will be required 8 Operation 8 1 General Measurement Considerations Cables have additional capacitance that increases the time required for a signal to settle its true value To reduce settling time Campbell Scientific Control Power Datalogger Copper Copper GND 1H 1L VX AM25T H L VX Analog Ground1 1H 1...

Page 17: ...figurations for various supported sensors providing a quick way to generate a program and wiring diagram FIGURE 8 1 Short Cut can be downloaded free of charge www campbellsci com FIGURE 8 1 Short Cut Short Cut is the best source for up to date datalogger programming code Programming code is needed when Creating a program for a new datalogger installation Adding sensors to an existing datalogger pr...

Page 18: ... reference temperature for thermocouple measurements The AM25T instruction and parameters are as follows AM25T Dest Reps Range AM25TChan DiffChan TCType TRef ClkPort ResPort ExChan RevDiff SettlingTime Integ fN1 Mult Offset For information on this instruction refer to the CRBasic Help 9 Maintenance Maintain a level of calibration appropriate to the application Campbell Scientific recommends factor...

Page 19: ...e Open Assuming the default paths were used when Short Cut was installed navigate to C CampbellSci SCWin folder The file of interest has the CR6 CR8 CR1 CR3 CR5 or CR9 extension Select the file and click Open 3 Immediately save the file in a folder different from C Campbellsci SCWin or save the file with a different file name Once the file is edited with CRBasic Editor Short Cut can no longer be u...

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Page 21: ...n High HI U5 Common Low LO U6 1 Analog Ground is the terminal located between the VX and HI terminals on the AM25T CRBasic Example B 1 CR6 Program Using One Instruction to Measure Both the Reference Temperature and Thermocouples CR6 Series Declare Variables and Units Public BattV Public PTemp_C Public RTempC Public Temp_C 25 Units BattV Volts Units PTemp_C Deg C Units RTempC Deg C Units Temp_C Deg...

Page 22: ...ry 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 Dat5Min NextScan EndProg ...

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Page 24: ...Rua Apinagés nbr 2018 Perdizes CEP 01258 00 São Paulo SP BRASIL www campbellsci com br vendas campbellsci com br Campbell Scientific Canada Corp 14532 131 Avenue NW Edmonton AB T5L 4X4 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A 300 N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Sci...

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