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, a
memory card with a capacity of
256 K, 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.
SPECIFICATIONS Measurements 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
Pens: 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 300
–
1 min
299 to 30
–
10 min
29 to 10
1200 to 120
1 h
–
199 to 60
2 h
–
59 to 40
3 h
–
39 to 20
4 h
–
19 to 10
12 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)
Display 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
Alarms 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
Memory Card (RD-MC256) Function: Setting and measured data memory Sampling Rate: Free mode (manual start), 135, 9, 5, 3, 1, 0.5, 0.2 Hz, trigger mode (starts by trigger conditions), 9, 5, 3, 1, 0.5, 0.2 Hz Memory Capacity: 256 K Data Length: 1000, 2000, 4000, 8000, 16000, 32000 data/channel (common setting to each channel, 2 bytes/data) Trigger Condition: Alarm detection, CHART END or external contact input (optional) Pre-Trigger: 0 to 100% (10% steps) Memory Data: Measured, interface input and computed data Output: Communication interface and recording output Standard Accessory: Lithium battery, shelf life of three years
† All dollar amounts on this site are shown in US currency.
Note: * Roll paper requires “-ROL” option on recorder. Comes with power cord, paper, 1 pen per channel, ribbon for printer version, an 8 K memory card for storing setup parameters only, plus complete operator's manual. If data storage is desired, purchase the RD-MC256 memory card separately. Ordering Example: (1) RD3721-25 2-pen recorder with printer, accepts thermocouple, RTD and voltage inputs, $3,565.00
