Instruction manual

Instruction Manual Smart-Trak
®
50 Series
IM-50 Rev. A.2 13
Instrument Power:
The Smart-Trak
®
50 Series requires a 24 VDC power supply (meter can use
15 VDC). Connect power to the 9-pin connector on the side of the
instrument (pins 5 and 6). If you are supplying your own power source, it
must regulate 24 VDC, and supply at least 315 mA (445mA for RS-485
controller) (meter can use 15 VDC, 85 mA) (215mA for RS-485 Meter).
The instrument is polarity sensitive. If you reverse this wiring, the instrument will not be
damaged, but it will not function.
Instrument Grounding:
The Smart-Trak
®
50 Series has very high levels of RFI and EMI shielding built into the
metal electronics cover (meets or exceeds the CE Standard EN 61326-1; 2006). To
maintain the integrity of this CE rating, it is critical that a path be provided for any residual
internal noise to exit the instrument or it may register on the outputs. Grounding provides
this path.
To properly ground your instrument, secure the chassis to solid earth ground using the
mounting holes on the bottom of the flow body. If the instrument will be used without
permanent mounting (on a laboratory bench, for instance) then connect the shield wire (no
insulation) to earth ground in your facility. If you purchased a Sierra power supply, a
ground wire is provided for your convenience.
CAUTION! This instrument is not a loop-powered device! Do NOT apply power to the 4-
20 mA / 0-5 VDC output or setpoint connections.
Analog Signals:
• Output Signal: Measure the current or voltage output signal, 4-20 mA / 0-5 VDC, across
pin 1 (positive) and 2 (negative). The minimum load is 50 Ohms, the maximum load is 500
Ohms.
 Setpoint: To transmit an analog setpoint, supply the current signal across pins 3 (positive)
and 4 (negative).
For Digital Communication:
You can communicate with your instrument using the Smart-Trak
®
50 Series User Software
package and your PC running the Windows operating system. See the pinout on the previous
page regarding the necessary RS connections pending RS-232 vs. RS-485. After consulting the
pinout diagram, plug the DB9 connector into an appropriate serial port on your PC for RS-232.
For an RS-485 instrument you must go through an appropriate RS-232 or USB converter. If you