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DC Input Isolating, Field Configurable Two-Wire Transmitter - T703

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The T703 has 16 overlapping input ranges which are field selectable via top-accessed DIP switches (see Table 1). The T703can accept input voltage spans from 20mV to 200 volts and input current spans from 1mA to 50mA. Bipolar selection modifies the unipolar range to include a negative offset (e.g. 200V becomes ±100V). The T703 provides 1000Vrms of transformer-coupled isolation and 120VAC continuous input overload protection. The top-mounted super bright LED illuminates when the loop current is above 3.3mA. Standard surface mount RFI filters reject walkie-talkie interference and noise. Current output is in proportion to the selected voltage or current input.

The T703 has 80% zero “turn-up” and 80% span “turn-down” adjustments within any user-selected input range. For example, Range 11 of Table 1 specifies 0 to 100V with a minimum span of 20V (100V - 20V = 80V, or 80%). This 80% adjustability allows the user to field-calibrate the unit from the maximum (0 to 100V) down to any minimum (20V) span (e.g. 25V to 45V) within the selected 0 to 100V range. The same is true in any user-selectable range: all spans are field adjustable from 20% (minimum span) to 100% of the specified range.

Application

The T703 is useful in any application requiring an isolated two-wire loop current from a DC source. Typical applications include long distance signal transmission and the elimination of ground loops. The output of the T703 can be used to drive a digital meter for direct display, or to interface with a computer for monitoring and control applications.

The model T703 is FM approved for intrinsically safe operation, entity, Classes I, II, III, Division 1, Groups A-G and Nonincendive, Class I, Division 2, Groups A-D hazardous when installed per manufacturer’s drawing 790-0028-00.

T703

FEATURES:

  • Eliminates Ground Loops

  • Field Configurable Input Ranges: 20mV to 200V, 1mA to 50mA

  • FM and CSA Safety Approval for Hazardous Installations

  • RFI Filters Minimize Transmission Faults

  • Super Bright LED Provides Go/No-Go Loop Status

MORE INFO:

  • Specifications

  • Ordering Information

The model T703 is CSA approved for intrinsically safe operation for Class 1, Division 1, temperature code T3C, Groups A, B, C and D hazardous locations when installed per manufacturer’s drawing 790- 0025-00. Refer to model F703 for NEMA 4, FM/CSA/CENELEC approved explosion-proof housing.

TECHNICAL SPECIFICATION (T703)

Input Span Range (Min/Max)   

See Table 1.

  • Note: Bipolar span selection will move unipolar range to reflect negative offset (e.g., 20mA = ±10mA)

 

Input Inpedance 

  • Ranges 1-4: 5M Ohms, typical

  • Ranges 5-12: >200k Ohms, typical

  • Ranges 13-16: 20 Ohms, typical

 

Output Span (fixed)   

4-20mA

 

Minimum Output Current   

3.3mA, typical

 

Maximum Output Current   

24mA, typical

 

Supply Voltage Range   

13 to 80VDC

 

Maximum Change In Supply Voltage Effect 

0.05% of Span

 

Maximum Changes In Load Effect   

0.05% of Span

 

Loop Voltage Drop   

13VDC @ 20mA

 

Output Current Limiting     

  • Active: 27mA

  • Fused (fixed): 0.25A

 

Entity Parameters   

  • VOC = 33VDC, ISC = 178.5mA,

  • CI = 12nF, LI = 0uH

 

Stability 

  • Zero: ± 0.02% of span/°C, max. (±0.05%, bipolar)

  • Span: ±0.03% of span/°C, max.

 

Accuracy     

  • Overall (Includes best straight line Linearity, Hysteresis & Repeatability @ 25°C): ±0.2% of any adjusted span, max.

  • Linearity: ±0.1% of range

  • Hysteresis & Repeatability: ±0.05% of range

  • Settability: ±0.05% of range

Zero Adjustability   

80% “turn-up” of span (max)

 

Span Adjustability   

80% “turn-down” of full-scale range (max)

 

Response Time (63% response)   

100ms, max.

 

Output Ripple     

0.1% of span, rms, typical 0.5%, max.

 

Normal Mode Rejection   

16dB @ 60Hz

 

Common Mode Rejection   

60Hz: 80dB, DC: 120dB

 

CMR 

  • 60Hz: 1000Vrms

  • DC: 1000VDC

 

RFI Effect (1.5W, 470MHz at 1.7 ft)   

<1% of span error

 

Isolation     

1000Vrms maximum, input to output, input to case,output to case.

 

Temperature Range     

  • Operating: -40 to 80°C

  • Storage: (-40 to 176°F)

 

Weight     

0.58lbs

 

Agency Approval   

  • FM approved intrinsically safe for hazardous locations, certificate No. J.I. 1V4A5.AX.

  • CSA approved intrinsically safe for hazardous locations, Class I, Division I, Groups A-D, when connected in accordance with manufacturer's drawing 790-0025 (File No. LR42272-40).

Ordering Information
1. Specify: Model:   T703-2000
2. Option: U (see text)    
3. Optional Custom Factory Calibration: Specify C620 with desired input and output range.
Accessories
     
  M004   Snap-in channel track, 4 ft. (non-conducting).
  T902   Mounting plate for M004, includes 4" track.
  T910   Bulkhead (flat surface) mounting plate.
  T805   NEMA 4, explosion proof enclosure
  9046   Action Pak 24/40VDC, 65mA power supply.
  T609   24V, 600mA loop power supply.
  V565   3-1/2 digit remote loop-powered indicator, wide-ranging display, NEMA 4X enclosure. CSA & FM approval standard, specify Option C to house Transpak.

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