Friday, 10 June 2011 18:19 Last Updated on Monday, 22 August 2011 01:29 Written by Administrator

FDT5500 FIELD MOUNT TRANSMITTER STRAIN GAUGE (BRIDGE) INPUT

  • NEMA 4X Splashproof Enclosure 
  • 3-1/2 Digit Display 
  • Input Spans as low as 0.4mV/V (at 10V excitation) 
  • Excitation Adjustable from 4 to 12V 
  • Offset and Nonstandard Ranges Available 
  • Urethane-Coated Circuit Boards 
  • AC or DC Power Options

FDT5500
PDF
DATA SHEET

The Model FDT5500 Strain Gauge Transmitter supplies excitation to a strain gauge or other resistance bridge, amplifies the bridge voltage and provides a proportional, isolated DC voltage or current output. A low-drift input amplifier maintains accurate readings under varying ambient conditions. Excitation voltage may be set anywhere between 4 and 12 volts.

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 FDT5500 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). Bridge applications other than strain gauges are possible: Contact the factory with your requirements.

For field mount transmitters without a display, select any plug-in transmitter module plus our ENCL-1 NEMA-4X enclosure. (see Accessories page)

ORDERING INFORMATION

Model Number: 

FDT5500

Power: 

Add suffix A (Model FDT5500A) for AC power, D for DC power. Specify 115Vac, 230Vac, 12Vdc or 24Vdc.

Input Range: 

Specify range required in millvolts (mV), volts (V) or millivolts per volt (mV/V). For example, with 10V bridge excitation a range of 0/20mV is the same as 0/2 mV/V. See specifications below for input capabilities. Offset input ranges are allowed.

Bridge Excitation: 

User-adjustable. Normally factory-set to 10V. For other settings specify any voltage between 4 and 12Vdc. (Note: 40mA maximum load. For 120ohm bridges, specify 4.8V or less.)

Output Range: 

Specify any DC voltage or current range allowed by the "Output Capabilities" spec, below.

Display Range: 

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, FDT5501A).

Loop-Powered Output: 

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, FDT5502A).

Urethane Coating: 

Specify Option U.

Conduit Connection: 

Standard: None. The enclosure has knockouts. Option NPT: Single 1/2 inch NPT fitting (glass-fiber reinforced nylon) at the bottom of the housing.

ELECTRICAL CONNECTIONS

Connections are made to 8 terminals within the enclosure:

1: Input plus (bridge output). 
2: Input minus (bridge output). 
3: Bridge excitation plus.
4: Bridge excitation minus. 
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).

DETAILED SPECIFICATIONS

Input Capabilities: 

4mV (0.4mV/V at 10V excitation) minimum span, 10V (1V/V at 10V excitation) maximum. Offset ranges are allowed. (Input Impedance: 200kohms.)

Excitation Voltage: 

Adjustable 4 to 12Vdc. Factory set to 10V unless otherwise specified. 40mA maximum current. (120 ohm bridges limited to 4.8V excitation or less. 350 ohm bridges ok to 12V.)

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).

Display Capabilities: 

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 or 10 microvolts, whichever is greater.

Adjustability: 

Zero and span each are adjustable approx. +/-15% of span.

Linearity: 

+/-0.05% of span or better.

Response Time: 

Under 100 milliseconds.

Isolation: 

3-way (Power/Input/Output) 1,500Vac rms (2,100V peak).

Guaranteed Operating Temperature: 

-10 to +60˚C (14 to 140˚F).

Temperature Stability: 

+/-(0.02% of span plus 1.3 microvolts) per ˚C, or better.

Power Requirements: 

AC, 115 or 230Vrms, 50/60Hz, 2.5V-A. DC, 12 or 24V, 2.5W.