The Model FDT5800 Potentiometer Input Transmitter provides an isolated DC output proportional to the position of a potentiometer or slidewire wiper. The input range may be 0-100% or any 10% or wider portion of the wiper's travel. Calibration is unaffected by the potentiometer's end-to-end resistance.
A rugged NEMA 4X splashproof, corrosion-resistant housing protects the transmitter in outdoor and industrial environments. The circuit boards are urethane coated for protection against condensation and contaminants. Model FDT5800 includes a 3-1/2 digit user-rangeable display to provide local process indication in engineering units.
Available options include AC and DC power choices and reverse-acting transmitter (decreasing output with increasing input).
For field mount transmitters without a display, select any plug-in transmitter module plus our ENCL-1 NEMA-4X enclosure. (see Accessories page)
Add suffix A (FDT5800A) for AC power, D for DC power. Specify 115Vac, 230Vac, 12Vdc or 24Vdc.
It is not necessary to specify the potentiometer's resistance. Just make sure it is not less than 100 ohms nor more than 100Kohms.
Specify 0/100%, or any 10% or wider portion of the travel (for example, 60/70%).
Specify any DC voltage or current range allowed by the "Output Capabilities" spec, below.
Specify display reading at low end and at full scale, including decimal point if required. See "Display Capabilities" specification, below. Note that reverse-acting display is possible - full scale reading downscale from low end. Display may be re-ranged by user.
Reverse-Acting Transmitter (decreasing output with increasing input):
Change last digit of the model number to 1 (for example, FDT5801A).
4/20mA "current sink" output stage for connection to devices whose inputs provide 24Vdc loop excitation. Change the last digit of the model number to 2 (for example, FDT5802A).
Specify Option U.
Standard: None. The enclosure has knockouts. Option NPT: Single 1/2 inch NPT fitting (glass-fiber reinforced nylon) at the bottom of the housing.
Connections are made to 8 terminals within the enclosure:
1: Counterclockwise (0% travel).
3: Clockwise (100% travel).
4: No connection.
5: Output plus.
6: Output minus.
7: Power (AC or, if DC power option, DC plus).
8: Power (AC or, if DC power option, DC minus).
May be any resistance between 100 ohms and 100Kohms. Calibration is not affected by the potentiometer's resistance.
0 to 100% travel, or any 10% or wider portion of the travel (for example, 45 to 55% travel).
Voltage Output Capabilities:
1 volt minimum output span, -10 to +15V absolute limit. Offset ranges are allowed. Maximum output load, 10mA (1Kohm at 10V output).
Current Output Capabilities:
1mA minimum output span, 0 to +25mA absolute limit. Positive offsets are allowed, negative outputs are not. Output drive capability, 24V (1,200 ohms max. at 20mA output).
Low end and full scale readings may be anywhere between -1999 and +1999 counts. A fixed decimal point may be added in any position. Minimum span (full scale minus low end) is 10 counts. Reverse-acting display is possible (full scale reading downscale from low end). Display may be re-ranged by user.
Accuracy (factory calibration):
+/-0.1% of span.
Zero and span each are adjustable approx. +/-15% of span. When ordered for 0-100% travel, the adjustments are set up so as to allow calibration to any 75% or wider portion of the travel (for example, 0-75% or 25-100%).
+/-0.05% of span or better.
Under 100 milliseconds.
3-way (Power/Input/Output) 1,500Vac rms (2,100V peak).
Guaranteed Operating Temperature:
-10 to +60˚C (14 to 140˚F).
+/-0.02% of span per ˚C, or better.
AC, 115 or 230Vrms, 50/60Hz, 2.5V-A. DC, 12 or 24V, 2.5W.