T773中文资料

Description

The T773 isolating two-wire transmitter has 5 input ranges and 2 output ranges, all of which are field selectable via top-accessed DIP switches. The T773 can accept square, triangle or pulse waveforms up to 18KHz with amplitudes from 10mVrms to 35V peak-to-peak. The T773 provides 1000Vrms of transformer-coupled isolation with outputs of either 4-20mA or 10-50mA. Current outputs are in proportion to a selected frequency input.

The T773 has 30% zero “turn-up” and 80% span “turn-down” adjustments within any user-selected input range. For example, Range 3 of Table 1 specifies 0 to 2100Hz with a minimum span of 420Hz (2100Hz - 420Hz = 1680Hz, or 80%). This 80% adjustability allows the user to field calibrate the unit for the maximum range of 0 to 2100Hz down to the minimum range of 0 to 420Hz. The maximum obtainable offset is 30% of the calibrated span: a calibrated range of 0 of 1000 Hz can be offset by 300Hz (e.g., 300Hz to 1000Hz).

Application

The T773 is useful in any application requiring isolation of a 2-wire loop current from a pulse output transducer, such as a magnetic pickup or a turbine flowmeter. The output of the T773 can be used to drive a digital meter for direct display of flow or velocity, or to interface with a computer or PLC for monitoring and control applications.

The T773 is CSA approved for intrinsically safe operation in Class I, Division 1, Groups A, B, C and D hazardous locations when installed per manufacturing drawing number.

Options

U

Urethane Coating of internal circuitry for protection from corrosive atmospheres.

TRANSPAK TM

T773

Benefits

Eliminates Ground Loops

Digitally-Synthesized,

Field Configurable Ranges (105Hz to 18kHz)

Wide Ranging

Zero and Span Adjustability Direct Magnetic Pickup Input Velocity/Flow Applications

Protects Equipment with 1000VRMS Isolation

Frequency Input, Isolating Field Configurable

Two-Wire Transmitter

Provides an Isolated Current Loop in

Proportion to a Frequency Input

Calibration

Factory settings are:Input Range:1

Output Range:4-20mA

1. Open the access lid on the top of the unit (see Top View Diagram).

2. Select the output range using switch S6. The CLOSED position selects a 10-50mA output.The OPEN position selects a 4-20mA output.

3. Select the input range from Table 1 and configure switches S1 through S5.

4. Determine the percent of span by the ratio of the desired maximum input to the input limit in Table 1 (e.g., 1000Hz/2100Hz = 48%).

5. Set the step Span rotary switch to the desired percent of span (e.g., 48% = position 4).

Percent of Span

Position 100%A ≥90%9≥80%8≥70%7≥60%6≥50%5≥40%4≥30%3≥20%

2

6. Determine Zero turn-up % by the ratio of desired minimum input to the desired maximum input (e.g., 0/1000Hz = 0%).

7. Set step Zero turn-up switch to offset %.(e.g., 0% = position 0).

Zero Turn-Up %

Position

0%0≤10%1≤20%2≤30%

3

8. Connect the input to a calibrated frequency source. Connect the output loop to a voltage supply and monitor the output current (refer to the terminal wiring).

Table 1: T773 Input Ranges

9. Set the calibrator to the desired minimum and adjust the fine zero to obtain an output of either 4mA or 10mA.

10. Set the calibrator to the desired maximum and adjust the fine span to obtain an output of either 20mA or 50mA. Repeat steps 9 and 10,if necessary, for maximum accuracy.Note: If loop current "swings" on input ranges 1-2, close S-5 for extra filtering.

Field Mounting

The T773 is designed for installation in indus-trial field environments. A sealed, diecast

aluminum housing protects against corro-sion, moisture, dust and electrical noise such as radio-frequency (RFI) and electromagnetic (EMI) interference.

For protection against extreme moisture, hose-directed water (NEMA 4) or hazardous envi-ronments, use the T805 explosion-proof hous-ing. The T805 provides a 1/2" and 3/4" FPT port for operation in harsh process environ-ments. The T805 is FM and CSA certified for use in Class I, Groups B, C & D and Class II,Groups E, F & G hazardous locations.

Range Switch Position

Input Limits Minimum Span

1

2

3

45

10 to 18KHz 3600Hz

20 to 9KHz 1800Hz

30 to 2100Hz 420Hz

4

0 to 525Hz

105Hz

Key: = 1 = ON or Closed

Models & Accessories

Ordering Information

Specify:

1. Model: T773-0000

2. Options: U (Urethane coating)

3. Optional Custom Factory Calibration: Specify C620 with desired input and output range.

Accessories

Model Description

M004Snap-in Channel Track, 4 feet.

T902Mounting plate for M004, includes 4" track.T910Bulkhead (flat surface) Mounting plate.T805

Side feed field-mountable housing (EP &NEMA 4 rated), uncoated (specify Option P for white polyester powder coat).

AP9046Action Pak 24/40VDC 65mA Power Supply.T60924V, 600mA Loop Power Supply.V5653-1/2 digit remote loop-powered indicator,

wide-ranging display, NEMA 4X enclo-sure, CSA & FM approval standard,specify Option C to house TransPak

Specifications

Input

Span Range (Max/Min)See Table 1

Type: Capacitive coupled Minimum Amplitude:

105-2150Hz: 10mVrms >2150Hz: 15mVrms Maximum Amplitude:35Vp-p Impedance

100-1KHz: >6k Ohms >1KHz: >40k Ohms Output Span

4-20mA/10-50mA, switch selectable Minimum Output Current 3.3mA, typical

Maximum Output Current 4-20mA: 24mA, typical 10-50mA: 58mA, typical Supply Voltage Range 4-20mA: 13 to 75VDC 10-50mA: 13 to 50VDC Line Regulation

0.07% of span (13-75V)Load Regulation

0.05% of span (0-3k Ohms)Voltage Drop 13VDC @ 20mA

Eurotherm Controls

741-F Miller Drive

Leesburg, VA 20175-8993703-443-0000

info@https://www.wendangku.net/doc/8f10290301.html, https://www.wendangku.net/doc/8f10290301.html,

Factory Assistance

For additional information on calibration, operation and installation contact our Technical Services Group:

703-669-1318

721-0418-00-K 09/04 Copyright? Eurotherm, Inc 2004

Action Instruments Barber-Colman Eurotherm Chessell Eurotherm Controls actionsupport@https://www.wendangku.net/doc/8f10290301.html,

Dimensions

Dimensions in millimeters (inches)

Stability Zero:

±0.015% of span/°C, typical,±0.028%/°C, max.

Span:±0.022% of span/°C, typical,

±0.043%/°C, max.

Overall Accuracy

(Includes Linearity, Hysteresis, Stability)±0.2% of adjusted span, max.Zero Adjustability 30% “turn-up” of span Span Adjustability

80% “turn-down" of full-scale limit (Table 1)Repeatability ±0.05% of span

Response Time (63% response)<9KHz: 500mSec.>9KHz: 40mSec.Output Ripple, P-P

(% at max. input range frequency; 0% turn-down)Range 1: 0.5% (18KHz)Range 2: 0.5% (9KHz)Range 3: 0.7% (2100Hz)Range 4: 1.2% (525Hz)

Common Mode Rejection 60Hz: 97dB, DC: 120dB Common Mode Range 60Hz: 75Vrms, max.DC: 1KV, max.

RFI Effect (1.5W, 470MHz at 1.5 ft.)<1% of span error Isolation

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

Operating Temperature Range 4-20mA: -40 to 80°C (-40 to 176°F)10-50mA: -40 to 60°C (-40 to 140°F)Weight 0.58lbs

Agency Approval

CSA approved intrinsically safe for hazardous locations (File No. LR42272-70).