IMTX200-03
www.ueonline.com
EARTH GROuND MuST ALWAYS bE CONNECTED TO THE GREEN WIRE
TO PROvIDE SHIELDING AND ELECTRICAL SAFETY.
WIRE IN ACCORDANCE WITH LOCAL AND NATIONAL ELECTRICAL
CODES. bY THE INSTALLATION, THE WIRES SHALL bE PROTECTED
AGAINST MECHANICAL DAMAGE. E.G. bY uSE OF A CONDuIT.
THE WIRING TO THE PRESSuRE TRANSMITTER MuST ONLY bE
CONNECTED IN THE SAFE AREA OR bY AN APPROvED TERMINAL
BOX CErTIFIED TO En 60079-1 Or En 60079-7 FOr hAZArDOus
LOCATIOns/FLAMEPrOOF ATMOsPhErEs. (ATEX rEQuIrEMEnTs OnLY)
A 1/2” nPT (male) or M20 conduit connection is provided on top of the
transmitter with 18 AWG, 72” leadwires. External grounding screw and clamp
is provided with option M460. The leadwires are color coded as follows:
4-20 mA output
Voltage (VDC) output
red:
+ signal
red: + vDC signal
Black: – signal
Black: – vDC signal
Green: Earth Ground
Green: Earth Ground
Blue: 1-5 v Output
The transmitter may be wired in either a sourcing (see figure 1A) or sinking
(see figure 1b) circuit.
Part II - Adjustments
SPANNING THE TX200A™ TRANSMITTER uSING THE
SHuNT CAL. FEATuRE
The range of the TX200A can be adjusted by a ratio of 5:1 using the shunt
calibration feature (see figure 3). No pressure source is required for this process.
Example:
A 1,000 psi range TX200A can be adjusted for any range between 0 to 200 psi
and 0 to 1,000 psi.
use the formula below to calculate l
cal
or v
cal
. This number represents the output
current or voltage that the user will set with the shunt cal. on in order to achieve
the desired range.
4-20 mA models formula:
I
cal
= (Cal# x 16mA/P
cal
) + 4mA
Voltage out (VDC) models formula:
V
cal
= (Cal# x V
FSO
/P
cal
) + V
zero
•
I
cal
is the output current that the user will set, with the shunt cal on to achieve
the desired full scale pressure range (P
cal
)
•
v
cal
is the output voltage that the user will set, with the shunt cal on to achieve
the desired full scale pressure range (P
cal
)
•
Cal# is the amount of pressure simulated by turning the shunt cal on. The
Cal# is engraved on the TX200A housing and written on the Certificate of
Calibration.
•
P
cal
is the full scale pressure range the user is adjusting to.
•
v
zero
is the output of the voltage (vDC) out model with no pressure applied.
•
v
FSO
is the full scale output, in volts, of a voltage (vDC) out model.
Example: For a TX200A with a 1-5 Volt output: Vzero = 1 volt and VFSO = 4 volts
Procedure:
1. Determine the desired pressure range
2. Calculate Ical for 4-20mA models or vcal for voltage (vDC) models using
the formulae above.
3. Power the TX200 with a suitable power supply.
a.
4-20mA
models can be powered with a 24vDC power supply
and 100Ω resistor in series. The voltage across the resistor
represents the current in the loop. 100mv = 1mA.
b.
Voltage (VDC)
out models can be connected directly to a 24v
power supply. The output voltage is measured between the blue
(+) and black (–) wires.
Please refer to figure 3 for steps 4-7.
4. Adjust the zero as necessary.
5. Turn the Cal switch clockwise to the on position.
6. Adjust the Span and Fine Span controls until the output reaches the I
cal
or v
cal
number calculated in step 2.
7. Turn the Cal switch counter-clockwise to the off position.
8. The transmitter should now be adjusted to the desired pressure range.
Example:
End-user has a uE transmitter P/n TX200A10s1(0 to 2500 psig /0 to 172,4 bar range).
For a particular application, a 0-1500 psig (0 to 103,4 bar) range is desired using this transmitter
- this is the
P
cal
.
The
Cal#
engraved on the transmitter housing is 424 psi (29,2 bar). using the
formula above,
I
cal
= (424 x 16/1500) +4, the
I
cal
calculated is 8.52. When all steps above are
completed, the transmitter in this example would be spanned so that the 4 mA output signal = 0
psig and the 20 mA output signal = 1500 psig (103,4 bar).
Figure 1C
Figure 3
Figure 1A
Figure 1B
4-20 mA output
Voltage output
Figure 2
4-20mA output:
•
1300 ohms max at 36 vDC
• 700 ohms max at 24vDC
voltage (vDC) output:
•
2000 ohms min
LoAD IMPEDANCE
