Programmable
Isolated 3 wire Potentiometer Transmitter
Model IST-P
Installation and Operation Guide
i
SignalTrans® IST-P is a 2-wire loop-powered isolated potentiometer
transmitter. It converts 3 wire potentiometer into a scalable linear 4~20mA
output current. Microprocessor based designed make it flexible to accept up
to 15 user defined linearization points. various input signals including mV, V,
mA, PT100 and 9 different thermocouples. The measuring unit and range are
also configurable with a user-friendly software
i
SignalWin® via PC.
Features
■
Up to 15 User defined linearization points available
The user linearization feature allows the volume of a tank’s contents to be
caculated from the height of the material in the container. Up to 15
linearization points can be defined by user in the measurement range.
■
Configurable without power connected
■
3750 Vrms isolation between input and output
■
2-wire loop-power technology 4 to 20mA analogue output
■
Fault signal on sensor break presettable
■
Accept 200~60K ohms 3 wire potentiometer input
Specification
Input signal :
3 wire 200~60K ohms potentiometer.
Measuring accuracy :
±0.1%
A/D resolution :
16 bits
Input sampling rate :
<200mS.
Output signal :
Analogue 4 to 20mA, 20 to 4mA.
Output resolution :
0.6uA (15 bits)
Output response time :
<200mS.
Load :
Max. (VPower supply - 10 V) / 0.020
Power supply :
10 to 36 V, internal protection against polarity inversion.
Common mode rejection ratio :
>80dB.
Galvanic isolation :
3.75 KVrms. between input and output
Input current required
≤3.8mA
Current limit
≤23mA
Operating temperature :
0to 55°C
Humidity :
0 to 90% RH
Figure 1. Dimension in mm
Installation
Mounting
Electrical Connection
Accessary
URC-1020 Interface cable
EzPro hand held programmer
Figure 2. Terminal connections
Wiring Specification :
Srew tightening torque : 3.5 lb-in
Wire range : 16~26 AWG
Wire strip length : 5~6mm
Wiring Precaution :
1. Always keep signal wires away from power or contactor wires.
2. The power supply of
i
SignalTrans® should not be shared with contactors,
electrical motor and other inductive devices.
Operation
The output current are calibrated within the specified accuracy at factory.
However, a recalibration is implemented to provide fine adjustments to the
input and output signal in the field. This is accomplished by
i
SignalWin®
software.
Configuration
The
i
SignalTrans® transmitter is user configurable with the
i
SignalWin® PC
software and URC-1020 interface cable or a EzPro hand held programmer.
■
i
SignalWin® is user-friendly software. The lastest release version can be
download free from
www.vertex-tw.com
■
URC-1020 Interface cable
consist of interface converter and USB plug. It
can be purchased separately from
i
SignalTrans® supplier.
During configuration the transmitter can work alone with or without connecting
to a power source. The configuration connection is shown in Figure 3.
Figure 3. Configuration connection
Figure 4 show the configuration screen of
i
SignalWin®. The help menu
provides further detail information about the IST-P transmitter and the
software. The Configurable parameters are :
1.
Input signal :
200~60K ohms
2.
Measuring range :
0.0~100.0 %
3.
Output direction :
Defines the scalable analogue output signal to be 4 to
20mA or 20 to 4mA.
4.
Fault signal on sensor break :
Defines the output signal to be upscale
(>20mA) or downscale (<4mA) on sensor break.
5.
Offset Correction :
Allows to eliminate the offset error of measuring value.
6.
4~20mA Output Signal Adjustment :
Zero and Span adjustment of output
signal. A power source shoule be connected as Figure 5.
7.
User defined linearization :
Depend on the model No.. up to 15 user
defined linearization points available
8.
Measuring value :
Read the measuring value from transmitter continually.
9.
Device information :
Indicate the device model, firmware version, series
number and communication status.
Figure 4. Configuration screen
Figure 5. Output Signal Adjustment connection
Electromagnetic compatibility (EMC) :
En 50081-2, En 50082-2
Dimension :
shown in Figure 1.
Housing material :
ABS plastic. UL 94V0
Weight :
19g
