IMTX200H-03
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WIRING
No special or separate wiring is required for digital communication with HART
devices since the HART FSK (Frequency Shift Keying) signal is superimposed
on top of the 4-20 mA output signal. Digital data is sent to and from the field
device via a HART master while real-time process information is available via
the 4-20 mA signal. It is recommended that a high quality twisted pair or
shielded wire cable be used where extended lengths are required or electrical
noise may be present.
NOTE
: The TX200H is reverse bias protected so no damage will result in
the event of accidental reversal of power leads.
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING UNIT. ELECTRICAL
RATINGS STATED IN LITERATURE AND ON THE TRANSMITTER MUST
NOT BE EXCEEDED.
WIRE IN ACCORDANCE WITH LOCAL AND NATIONAL ELECTRICAL
CODES. THROUGH PROPER INSTALLATION, THE WIRES SHALL BE
PROTECTED AGAINST MECHANICAL DAMAGE, I.E. BY USE OF A
CONDUIT.
THE TX200H TRANSMITTER ACCEPTS A SUPPLY VOLTAGE OF 10-36
VDC AND SHALL NOT EXCEED 36 VDC. THE SUPPLY VOLTAGE MUST
BE ISOLATED FROM MAINS VOLTAGE BY DOUBLE/REINFORCED
INSULATION.
EARTH GROUND MUST ALWAYS BE CONNECTED TO THE GREEN WIRE
TO PROVIDE SHIELDING AND ELECTRICAL SAFETY.
THE TX200H WIRING MUST BE INSTALLED IN A GROUNDED METAL
CONDUIT OR WITH OTHER SUITABLE SHIELDING IN ORDER TO MEET
EUROPEAN EMC DIRECTIVE REQUIREMENTS.
ATEX REQuIREMENTS oNLY
THE WIRING TO THE PRESSURE SENSOR MUST ONLY BE CONNECTED
IN THE SAFE AREA OR BY AN APPROVED TERMINAL BOX CERTIFIED
TO EN 60079-0:2012, EN 60079-1:2007, EN 60079-31:2009 FOR
HAZARDOUS LOCATIONS.
EXTERNAL GROUNDING SCREW (OPTION M460) IS REQUIRED FOR
NON-METALLIC CONDUIT SYSTEMS (SEE FIGURE 1).
A 1/2” NPT (male) or M20 conduit connection is provided on the top of the
transmitter with 18 AWG, 72” length lead-wires. An external grounding screw
and clamp is provided when selecting option M460 (see figure 1). The lead-
wires are color coded as follows:
Red: +signal
Black: - signal
Green: Earth ground
Bench operation:
To operate the TX200H on the bench, it must be connected to a power supply
and a load resistor (see Figure 2). The HART master (e.g., handheld com-
municator) may also be connected directly across the red and black wires at
the TX200H. A voltmeter across the 250 Ω resistor can be used to measure
the current in the loop ( Iloop = Vresistor / 250 ). At 4mA the voltmeter will
read 1 volt and at 20 mA the meter will read 5 volts.
Field operation:
The TX200H can be connected to any HART compatible input card or module
or any standard 4-20mA input if the HART interface is not being used. In
most cases the power supply and the load resistor are built into the input
card or module (see Figure 3).
Power Supply/Load Limits:
For general operation of the TX200H while using HART the series loop resis-
tance should be between 230 to 600 ohms and the power supply voltage
should be 24V nominal.
The TX200H can be operated without the HART interface within the operating
limits of the power supply and loop resistance as shown in Figure 4.
Fault Currents:
Under normal operating conditions the analog output signal of the TX200H
will remain between 4-20mA. In the event that the pressure goes beyond
the operating range of the device or in a fault condition, the TX200H will indi-
cate the condition on the 4-20mA loop as follows:
Loop Current
Description
3.7 mA
Check Sum Error
3.9 mA
Low Limit of Output Range
22.0 mA
Upper Limit of Output Range
24 mA
Fault Current
Figure 1
Figure 2
+
Power Supply
-
TX200H
HART Master or
Hand Held
Calibrator
Red
Black
250 Ω
Voltmeter
HART master/
handheld
communicator
Figure 3
Input Card/
Module
TX200H
Red
Black
Green
Loop
Resis
tance (max.)
Power Supply Voltage
Figure 4
