AM16/32B 16-channel or 32-channel Relay Multiplexer
The AM16/32B multiplexer significantly increases the number of sensors that you can measure with a Campbell Scientific data logger. It interfaces with the data logger and adds terminals so that you can wire additional sensors of almost any type.
- Significantly increases the number of sensors the data logger 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
- Electrical surge protection via gas tubes on all analog I/O, and varistors or TVS diodes on all other connections
- 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
-NOTE- | The protection on the reset, clock, and +12 V inputs are provided by 18 V TVS diodes. |
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Power | 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 A voltage divider such as the VDIV10:1 may be needed between the AM16/32B and the data logger to stay within the input limits of the data logger channel. |
Minimum Contact Life | 5 x 107 operations |
Maximum Contact Voltage Rating | 70 V |
Maximum Voltage | 8 Vdc (clock level) |
CE Compliance |
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Surge | Complies with IEC61000-4-5, test level 3 (±2 kV, 2 ohm coupling impedance) |
Operating Temperature Range |
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Dimensions | 23.9 x 10.2 x 4.6 cm (9.4 x 4.0 x 1.8 in.) |
Weight | ~680 g (~1.5 lb) |