AM16 CAMPBELL | Alldatasheet
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SCIENTIFIC N WHEN MEASUREMENTS MATTER Overview 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 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 Technical Description Depending on sensor type, the AM16/32B can multiplex 16 32, or48sensors. Up to six AM16/32Bs may be connected to the same data logger, depending on the number of control ports and analog inputs available. The AM16/328 either multiplexes 16 groups of four lines (a total of 64 lines) through four common (COM) terminals. Alternatively, a manual switch setting allows the AM16/32B to multiplex 32 groups of two lines (also a total of 64 lines) through two COM terminals. A cable connects the common terminals to data logger analog inputs, excitation channels, For comprehensive details, visit: www.campbellsci.eu/am16-32b AM16/32B 16- or 32-Channel Relay Multiplexer Greatly Increases Sensor Capacity Connects many sensors to single datalogger adds terminals for wiring additional sensors of almost any bpe. ) 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 1/0, 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 orground as required by the sensor. The data logger controls the multiplexer using two control ports, or one control port and one excitation channel. Electrical Surge Protection The equipment is protected from electrical surges using gas tubes on all inputs. A 35 V varistor is connected between the shield ground and ground lug to provide surge protection. The Reset, Clock, and +12 V terminals are protected by 18V TVS diodes.
-NOTE- Power Scan Advance Minimum Clock Pulse Width Maximum Actuation Time for Relay Relay Operation Initial Relay Resistance, Closed Maximum Switching Current Maximum Switching Voltage The protection on the reset, clock and +12 Vinputs are provided by 18V TVS diodes. Unregulated 9.6to 16 Vdc Occurs on the leading edge of the clock pulse transition (from below 1.5 Vto above 33 V) Tms 20ms Break before make 0.1 ohm 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) 50Vdc Avoltage divider such as the VDIV10:1 may be needed between the AM16/32B and the data logger to stay within the Minimum Contact Life Maximum Contact Voltage Rating Maximum Voltage CE Compliance Surge Operating Temperature Range Dimensions Weight ESD Air Discharge Contact Discharge input limits of the data logger channel. 5x107 operations 70V
8 Vdc (clock level)
EN 55022:1998 Class B EN61326:1998 Complies with [EC61000-4-5, test level 3 (2 kV, 2ohm coupling impedance) -55°10 +85°C (extended) -25°10 +50°C (standard) 239x102x46cm (94x40x 1.8in) ~680 g (~1.5Ib) Complies with [EC61000-4-2, test level 4 (£15 kV). Complies with [EC61000-4-2, test level 4 (8 kV). Typical Current Drain Quiescent Active Reset Levels Inactive Active <210pA 11 mA (typical in 4x16 mode) 6 mA (typical in 2x32 mode) <09V 33t08V a For comprehensive details, visit: www.campbellsci.eu/am16-32b CAMPBELL 80 Hathern Road, Shepshed, LE12 9GX UK | +(0)1509 828888 | sale@campbellsci.couk | www.campbellsci.eu SCIENTIFIC AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | FRANCE | GERMANY | INDIA | SOUTH AFRICA | SPAIN | THAILAND | UK | USA ©2020 Campbell Scientific, Ltd. | 10/16/2020