Bộ dồn kênh tự động Multiplexer Campbell Scientific AM16/32B

Thương hiệu: Campbell Scientific | Tình trạng: Còn hàng
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AM16/32B 16- or 32-Channel Relay Multiplexer

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Bộ dồn kênh tự động Multiplexer Campbell Scientific AM16/32B


The AM16/32B multiplexer significantly increases the number of sensors that can be measured by a Campbell Scientific datalogger. It interfaces with the datalogger and adds terminals for wiring additional sensors of almost any type.

Benefits and Features

  • Significantly increases the number of sensors the datalogger can measure

  • Can multiplex 16, 32, or 48 sensors

  • Supports many types of sensors including thermistors, potentiometers, strain gages, vibrating wires, reflectometers, and soil moisture blocks

  • Decreases the cost of cabling individual sensors on long wire runs

  • Allows a relay address to be used to go directly to a specific channel—reducing power consumption and wear on the relay switches

  • Protects the equipment from electrical surges by including gas tubes on all of the inputs and having a ground lug

  • Prevents sensor-cable damage by providing strain relief for sensor leads and independent routing for sensor shield lines

  • Eliminates the requirement for dc blocking capacitors for gypsum soil moisture blocks, significantly reducing sensor cost

Detailed Description

Depending on sensor type, the AM16/32B can multiplex 16, 32, or 48 sensors. Up to six AM16/32Bs may be connected to the same datalogger, depending on the number of control ports and analog inputs available.

The AM16/32B either multiplexes 16 groups of four lines (a total of 64 lines) through four common (COM) terminals, or multiplexes 32 groups of two lines (also a total of 64 lines) through two COM terminals. A cable connects the common terminals to datalogger analog inputs, excitation channels, or ground as required by the sensor. The datalogger controls the multiplexer using two control ports or one control port and one excitation channel.



Reset and clock protected by 8 V varistors; +12 V input is protected by +16 V TransZorb.


Unregulated 9.6 to 16 Vdc

Scan Advance

Occurs on the leading edge of the clock pulse transition (from below 1.5 V to above 3.3 V)

Minimum Clock Pulse Width

1 ms

Maximum Actuation Time for Relay

20 ms

Relay Operation

Break before make

Initial Relay Resistance, Closed

0.1 ohm

Maximum Switching Current

500 mA 
(Switching currents greater than 30 mA [occasional 50 mA current is acceptable] will degrade the contact surfaces of the mechanical relays and increase their resistance.This will adversely affect the suitability of these relays to multiplex low voltage signals.Although a relay used in this manner no longer qualifies for low voltage measurement, it continues to be useful for switching currents in excess of 30 mA.)

Maximum Switching Voltage

50 Vdc

Minimum Contact Life

5 x 107 operations

CE Compliance

  • EN 61326:1998

  • EN 55022:1998 Class B


Complies with IEC61000-4-5, test level 3 (±2 kV, 2 ohm coupling impedance)

Operating Temperature Range

  • -25° to +50°C (standard)

  • -55° to +85°C (extended)


  • 22.0 x 10.16 x 5.08 cm (8.7 x 4.0 x 2.0 in.) without mounts

  • 23.8 x 10.16 x 5.08 cm (9.4 x 4.0 x 2.0 in.) with mounts


~680 g (1.5 lb)


Air Discharge

Complies with IEC61000-4-2, test level 4 (±15 kV).

Contact Discharge

Complies with IEC61000-4-2, test level 4 (±8 kV).

Typical Current Drain


< 210 µA


  • 6 mA (typical in 2x32 mode)

  • 11 mA (typical in 4x16 mode)

Reset Levels


< 0.9 V


3.3 to 8 V



AM16/32B Relay Multiplexer


AM16/32B Relay Multiplexer

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