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.
Benefits and Features
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. |
| 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) |
ESD | |
| 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 | |
| Quiescent | < 210 µA |
| Active |
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Reset Levels | |
| Inactive | < 0.9 V |
| Active | 3.3 to 8 V |
