1-4 Channel Flatbed Recorders, Accepts dc Voltage, Thermocouple, and RTD Inputs - Discontinued

RD3720 Series

 | RD3720 Series

imagem meramente ilustrativa

2 anos de garantia
  • Accepts dc Voltage, 12 Types of Thermocouples and RTD Inputs
  • Choice of Measured Data, Bar Graph or Range Data Display Modes
  • Model RD3721 Has Printer and Electronic Pen Lift
  • Alarm Outputs of up to Four Points (Optional )
  • Optional GPIB or RS-232C Interface
  • 250 mm (10") Chart


The RD3720 Series has been discontinued. Please see the RD45A & RD46A as a possible alternative or contact our Data Acquisition Engineering Department.

The easy-to-operate OMEGA™ RD3721 and RD3722 flatbed pen recorders are sophisticated, high performance units which accept a wide range of input types. Features include a choice of measured data, bar graph or range data display modes. Versatile optional capabilities include GPIB or RS232C interface to handle data output and panel setting data,mathematical functions, remote controls, alarms, outputs up to four points and °F range data display. The RD3721 comes with an electronic pen lift and printer. The RD3722 comes with a manual pen lift. Both units provide high speed recording (1600 m/sec max), an auto span shift mode and partially expanded-scale recording, whereby any portion within full scale can be expanded or reduced for each pen.


Drive System: Automatic null-balancing digital servo mechanism with brushless DC servomotor
Type of Input: dc V, 1 mV to 200V FS; T/C Types J, K, E, T, N, C, J DIN, T DIN, R, S, B, Kp vs Au7Fe; RTD Pt100, Pt50, Ni100 Reference Junction Compensating
Accuracy (T/C): ±0.5°C (10.9°F) for K, E, J, T, N, C, J DIN, T DIN (and KP vs Au7Fe); 1°C for R, S and B
Filter: 0.1, 1 Hz or OFF (selectable)
Zero Set: Adjustable
Measuring Cycle: 135 Hz
Standard Pen Offset Compensation: Average, max/min recording selectable, resolution on time axis: 0.05 mm, automatic sweep function for pen offset, data selectable pen offset compensation reference pen
Input Impedance: Approx 1Ω (Vdc and thermocouple)
Allowable Source Resistance: <1 KΩ (Vdc and thermocouple)
Temperature Coefficient:
    Zero Drift: 0.05 µV/°C +0.01% of range/°C
    Full Scale: 0.01% of range/°C Maximum Allowable Input Voltage: 250 Vdc
Maximum Common Mode Voltage: 250 Vrms AC
Common Mode Rejection: More than 150 dB at AC
Normal Mode Rejection: More than 50 dB at 50 or 60 Hz

Recording And Printing
Disposable felt-tip pen cartridges (analog data)
Printing System: Wire-dot printer using ribbon cassette (digital data)
Effective Recording Span: 250 mm (analog data)
Pen Offset Between Channels: Approx 4 mm on the time axis
Number of Channels: 1, 2, 3, or 4
Recording Colors: First pen is red, second pen is green, third pen is blue, fourth pen is brown
Recording Accuracy: Measurement accuracy plus ±0.2% of effective recording span (including non-linearity, deadband and error between ranges)
Maximum Pen Speed: Approx 1600 mm/s (63 in/s)
Maximum Pen Acceleration: Approx 8G
Printing Rate: Approx 1.5 sec/line (for RD3721 only)
Chart: Z-fold chart, 270 mm x 20 m (10.6" x 65'); optional roll chart, 270 mm x 20 m (10.6" x 65')
Chart Speeds: 10 to 1200 mm/min and mm/h (1 mm steps), and 0.5 to 45.0 in/min and in/hr (0.1" steps)
Change of Chart Speed (Optional): Changes chart speed with remote control signals
Record ON/OFF Selectors: Independently provided for each channel on front panel (ON: measurement/recording, OFF: measurement)
Pen Lift: All pens are lifted and lowered simultaneously (for RD3721 only)
Chart Drive: Pulse motor drive
Chart Speed Accuracy: ±0.1% (at recording of longer than 1 m)
Digital Data Printout: Time, chart speed, channel number (tag number), measured data and engineering unit are printed out at the following intervals:
Chart Speed (1 mm = 0.03937)
mm/min mm/h Printing Intervals
1200 to 3001 min
299 to 30 10 min
29 to 10 1200 to 120 1 h
199 to 602 h
59 to 403 h
39 to 204 h
19 to 1012 h

Tag Number Printout: Tag number can be printed out in place of channel number, up to 7 alphanumerics (for RD3721 only)
Alarm Printout: Channel number, alarm type and the time of alarm ON/ OFF are printed (for RD3721 only)
Scale Markings Printout: 0% and 100% scale values can be printed out at the same interval as digital printout (for RD3721 only)
Program List Printout: Contents of entire setting memory can be listed on the chart (for RD3721 only)
Manual Printout: Time and measured data for all channels can be printed out in a single line by depressing the MANUAL PRINT key (for RD3721 only)
Message Printout: Message of up to 70 characters can be printed by depressing the MANUAL MESSAGE key (message 0), or by external contact signal (message 1 to 4; optional, up to 4 channels), for RD3721 only
Change of Chart Speed Printout: Chart speed and time can be printed out at the change of chart speed (for RD3721 only)
Pen Offset Compensation: ON/OFF Printout: ON/OFF mark and time can be printed out (for RD3721 only)
Change of Range Printout: Changed contents and time can be printed at the change of range, on auto span shift mode (for RD3721 only)
Partially Expanded-Scale Recording: Any portion within full scale can be expanded or reduced for each channel
Auto Span Shift Mode: Automatically shifts to ±50% of span, and recording continues when the input exceeds the measuring span
External Input Span: Small error of external converter can be corrected by setting the span with actual input voltage (zero is span left, full is span right)

Type of Display: Vacuum fluorescent display (5 x 7" dot matrix, blue), 20 characters for each channel
Display Modes: 3 display modes can be selected by depressing the DISPLAY SELECT key
    Digital Data Display: Measured data (7 digits), date, time and chart speed;
    Bar Graph Display: (2.5% resolution) Range Data Display

Number of Alarm Set Levels: Up to 2 levels/channel
Alarm Types: High (H), low (L), delta high (dH), and delta low (dL)
Alarm Outputs (Optional): Up to 4 points (internal, contact rating: 24 Vdc and AC 1 A)

Computing Functions
Standard Functions: Scaling (ranges: -22000 to +22000), and ØT
Standard Memory Card: For storing and setting data (memory capacity of 8 K), comes with lithium battery (with life of about 5 years)
Battery Back-Up Memory: Maintains all settings for about 10 years (at room temperature) when power is removed
Chart END Alarm: Automatic pen lift (for RD3721 only) at out-of-chart condition (alarm output, optional)
Mounting: Horizontal (can be tilted up to 10%)
Operating Range: 0 to 40°C (32 to 104°F); 0 to 80% RH
Insulation Resistance: More than 100 MΩ at 500 Vdc between power line and case, and between input terminals and case
Dielectric Strength: 1500 Vac for 1 minute between power line and case, and between input terminals and case
Power Requirements: 90 to 250 Vac, for both 50 and 60 Hz
Power Consumption: 1-channel model, 85 VA max, 45 VA balanced; 2-channel model, 100 VA max 50 VA balanced; 3-channel model, 115 VA max, 55 VA balanced; 4-channel model, 130 VA max, 60 VA balanced
Dimensions: 185 H x 448 W x 455 D mm (71.4 x 175.8 x 177.8")
Weight: from 14 kg (25.4) to 13.5 kg (29.8 lb) depending on configuration

Alarm Option (-AK04)
Number of Outputs: 4 points
Contact Rating: 24 Vdc and AC 1 A
Outputs: Alarm, FAIL alarm and chart END alarm outputs

GPIB Interface (-GPIB)
Functional, Electrical and Mechanical Specifications: Meets the IEEE Standard of 488-1978
Talker Functions: Input of measured data (ASCII), output of measured data (ASCII and binary), input/output of setting data (ASCII), output of memory data (ASCII and binary)
Listener Functions: Controls except for power ON/OFF key lock ON/OFF and chart drive

RS232C Interface (-RS232)
Functional, Electrical and Mechanical Specifications: Meets the EIA RS-232C
Controller Interface Functions: Input of measured data (ASCII), output of measured data (ASCII and binary), input/output of setting data (ASCII), output of memory data (ASCII and binary)
Data Transfer Rates: 75, 150, 300, 600, 1200, 2400, 4800, 9600 bps

Remote Controls (-REM)
Remote Control Signals: External contact, open collector of TTL-level signal
Chart Drive Control: Start, L logic level or closed contact; stop, H logic level or open contact
Message Printout: Start, L login level or closed contact (for RD3731 only)
Change of Chart Speed: Chart speed 2, L logic level or closed contact, chart speed 1, H logic level or open contact
Pen Lift: All recording pens lowered, L logic level or closed contact; all recording pens lifted, H logic level or open contact (for RD3721 only)
Record On/Off Selection: OFF (Measurement), L logic level or closed contact; OFF (measurement/ recording), H logic level or open contact
External Trigger: Data memory write, L logic level or closed contact
Math Option (-MATH): +, -, x, ÷, square root, absolute value, logarithm, exponential function (up to 4 channels); not available for 1-pen model

We noticed you are from the US. Visit your local site for regional offers and live support.