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DT7000
Select connection cable
Connection of the cable
screen
Selection power supply The DT7000 is a two-wire 4-20 mA transmitter.
20171206-V1
5. Connecting
5.1. Preparing the connection
The connection must be carried out by trained and
authorized personnel only!
Connect or disconnect only in the complete absence of
supply voltage
Use only a screwdriver with appropriate head
In hazardous areas should take note of the appropriate
regulations, conformity and type approval certificates of the
DT7000 and other instruments are connecting in the current
loop (e.g. IS output power supply, IS isolator, etc.).
Take note the suitability of the connecting cable.
It is recommended the use of screened twisted pair cable.
The wire cross-section should be 0.25-1.5 mm
You may use either solid conductor or flexible conductor. In
case of using flexible conductor use crimped wire end.
Take note of the corresponding installation regulations for
Ex applications. In particular, make sure that no potential
equalization currents flow over the cable screen.
Ground the cable screen on the instrument side.
In case of grounding on both sides (for suppress the
influence of high frequency interference signals) this can be
achieved by use of a capacitor (e.g. ceramic capacitor 1 nF,
1500 V) or separate potential equalization. The low
frequency potential equalization currents are thus
suppressed, but the protective effect against high frequency
interference signals remains.
The supply voltage is 12-28 VDC.
For other requirements see: Chapter 9.1. Technical
specification, Safety data.
It is recommended to use an intrinsically safe isolator power
supply.
(A possible application is shown in Chapter 9.2. Application
example)
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