Bộ dồn kênh tự động Multiplexer Campbell Scientific AM25T

Thương hiệu: Campbell Scientific | Tình trạng: Còn hàng
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AM25T 25-Channel Solid-State Thermocouple Multiplexer

Gọi 0904251826 để được trợ giúp

Bộ dồn kênh tự động Multiplexer Campbell Scientific AM25T

Overview

The AM25T 25-Channel Solid State Multiplexer increases the number of thermocouples that can be measured by a Campbell Scientific datalogger. The multiplexer interfaces with the datalogger and adds terminals for wiring additional thermocouples or other low-level voltage output sensors.

Benefits and Features

  • Greatly increases the number of thermocouples a datalogger can measure

  • Multiplexes up to 25 thermocouples

  • Includes an on-board PRT that serves as a reference junction

  • Allows several AM25Ts to be controlled by one datalogger increasing the number of thermocouples that can be measured

  • Uses a metallic, internal ground plane to reduce thermal gradients, which ensures more accurate measurements

  • Provides a vertical package for a smaller “footprint” that makes it easier to fit in a crowded enclosure

  • Supports a maximum cable length of 500 feet when lightning protection is used

Detailed Description

Up to 25 thermocouples are sequentially connected to a common differential channel on the AM25T. The output from this channel is wired to a differential input channel on the datalogger. As the AM25T sequentially changes channels, the datalogger measures the output from each thermocouple in sequence.

A PRT attached to the AM25T’s grounding bar provides a temperature reference for the thermocouple measurements. The heat capacity of the grounding bar and an insulated aluminum cover reduce thermal gradients along the length of the multiplexer. Reducing the thermal gradients allow more accurate measurements.

Specifications

Expandability

  • Assumes sequential activation of multiplexers and that each datalogger channel is uniquely dedicated.

  • 2 AM25Ts per CR800 or CR850

  • 4 AM25Ts per CR1000, CR3000, or CR10(X)

  • 6 AM25Ts per CR23X or 21X

  • 7 AM25Ts per CR725 card for the CR7s

Internal PRT Accuracy

  • ±0.2°C (-25° to +50°C)

  • ±0.4°C (-40° to +85°C)

Power

9.6 to 16 Vdc (under load), unregulated

Typical Relay Resistance

500 Ω

Maximum Switching Current

25 mA (Switching currents greater than 25 mA will damage the relays and render them unusable.)

CE Compliance

Conforms to EN55022-1:1995 and EN50082-1:1992.

Operating Temperature Range

-40° to +85°C

Operating Humidity Range

0 to 95% (non-condensing)

Dimensions

23.6 x 5.1 x 13.2 cm (9.3 x 2 x 5.2 in.)

Weight

0.9 kg (2.0 lb)

Typical Current Drain

Quiescent

0.5 mA

Active

1.0 mA

Enable Levels

Inactive

< 0.9 V

Active

3.5 to 5 V

Clock

Levels

Scan advance occurs on the falling edge of the clock pulse (from above 3.5 V to below 1.5 V)

Minimum ON Time

50 µs

Minimum OFF Time

60 μs

Download

Brochures

AM25T 25-Channel Solid State Multiplexer

Manuals

AM25T 25-Channel Solid State Multiplexer

Compliance

AM25T EU Declaration of Conformity

 

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