AM25T Solid-State Thermocouple Multiplexer
5
Operating Temperature
Standard:
–40 to 85 °C
PRT accuracy
±
0.4 °C
Operating Humidity
Noncondensing:
0 to 95%
Dimensions
Length:
23.6 cm (9.3 in)
Width:
5.10 cm (2.0 in)
Depth:
13.2 cm (5.2 in)
Weight:
0.91 kg (2.0 lb)
3.6 kg (8.0 lb); shipping
Expandability (Nominal)*:
2 AM25Ts per CR800 or CR850
3 AM25Ts per CR6
4 AM25Ts per CR1000, CR3000
7 AM25Ts per CR5000
CR9000X variable, depending on how many
CR9051E modules are installed
Maximum Cable Length:
Multiplexers can be located up to 305 m
(1000 ft) from the datalogger. When
lightning protection is required, do not
exceed 152 m (500 ft) in cable length. The
spark gaps will not fire if the heavy ground
wire is longer than 152 m (500 ft).
Typical relay Resistance:
500
Ω
Maximum Switching Current:
25 mA; switching currents greater than
25 mA will damage the relays and render
them unusable.
Compliance:
View the EU Declaration of Conformity at
www.campbellsci.com/am25t
*Assumes sequential activation of multiplexers and that each datalogger channel is
uniquely dedicated. If your application requires additional multiplexing capability,
please consult Campbell Scientific for application assistance.
7. Installation
7.1 Installing the AM25T
The AM25T may be operated in a non-condensing environment, such as a
laboratory, without being housed in an enclosure. For field use, the AM25T
must be protected against dust and liquid. Campbell Scientific offers weather-
resistant enclosures for this purpose.
Fasten the AM25T to the enclosure backplate. Securely fasten the leads to the
strain relief flange running between the AM25T terminal strips and install the
cover to reduce temperature gradients during thermocouple measurements.
