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Installation
Model 6-Wire
47
5
5.7.2 Cable Connection
The sensor cable must be provided by the user.
Note
The cable must include shielded wires. The screwed cable gland described below is not a strain relief!
Consequently, the cable must be clamped accordingly during the installation. The outside diameter of the
connecting cables (round cable) should lie between 6.5 to 9.5 mm (0.26 to 0.37 in). Note that it might be
necessary to additionally seal the cable entry to allow IP65 with smaller cables!
For information on how to mount the sensor cable, see section 5.7.2
5.7.3 Terminal Strip
Table 5-5: Pin Assignment for Terminal Strip
Pin
Description
485B
RS485-B negative signal
485A
RS485-A positive signal
AO+
+ Analog Out (positive)
AO-
AGND (analog ground)
GND
GND (digital ground)
+24V
+ VDC power supply
5.7.4 Analog Out
The 6-wire model of the Thermalert 4.0 Series is an infrared thermometer with a built-in analog output to drive
analog devices. The output can be configured to output mA, V, or TC by means of software or a dedicated ASCII
command. The output is short circuit resistant.
5.7.4.1 mA Output
The Analog Out can be set to 0-20 mA or 4-20 mA output current range. Direct connection to a recording device
(e.g., chart recorder, PLC, or controller) is possible. The total analog output circuit impedance is limited to 500 Ω.
For the principle wiring, use the installation scheme below.
Figure 5-13: Wiring Analog Out as Current Output
A specific feature for the testing or calibrating of connected equipment allows the current loop output to be set to
specific values, under range or over range using a dedicated ASCII command. Via such functionality, you can force
the instrument, operating in the 4-20 mA mode, to transmit an output current less than 4 mA (e.g. 3.5 mA) or above
20 mA (e.g. 21.0 mA).
5.7.4.2 V Output
The Analog Out configured as voltage output covers a range between 0 to 10 V. The minimum load impedance for
the voltage output must be 10 kΩ.
A
+
V
DC
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Содержание Thermalert 4.0 Series
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