1-4 Channel
Flatbed Pen Recorders
Accept DC Voltage, Thermocouple
and RTD Inputs
RD3700 Series
Starts at
$
1955
Shown with:
A) GKMQSS-125G-6 low-noise
thermocouple with 30°
connector, $27 (see page A-50)
B) PR-11-2-100-1/4-6-E RTD
probe, $66 (see page C-82)
C) OS36-K-240F infrared
thermocouple, $255
(see page J-47)
⻬ Accepts DC Voltage,
12 Types of
Thermocouples
and RTD Inputs
⻬ Choice of Measured
Data, Bar Graph
or Range Data
Display Modes
RD3722-42, $4704.
A
B
C
⻬ Model RD3721 Has
Printer and Electronic
Pen Lift
⻬ Alarm Outputs
of up to Four Points
(Optional )
S-45
⻬ Optional 256 K Memory
Card for Increased Data
Storage
⻬ Optional GPIB or
RS232C Interface
⻬ 250 mm (10") Chart
⻬ 115/230 Vac Powered
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)
Remember
to Order
Extra Pens
and Paper!
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)
Printing
mm/min mm/h 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
S-46
RD3722-42, $4704,
shown smaller than
actual size.
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
S
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:
Same as input Table
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 ⌬T
Standard Memory Card: For storing and
setting data (memory capacity of 8 K),
comes with lithium
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
1
(7
⁄4 x 175⁄8 x 177⁄8")
Weight: from 14 kg (25.4) to 13.5 kg
(29.8 lb) depending on configuration
battery (with life of
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 RS232C
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)
S-47
RD3722-42, $4704, shown
smaller than actual size.
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, ⴓ,
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
Convenient side panel inputs.
Extended Warranty
Program
SM
OMEGACARESMextended warranty program
is available for models shown on this page.
OMEGACARESMcovers parts, labor, and
equivalent loaners. Ask your sales representative
for full details when placing an order.
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
Options
Ordering Add'l
Suffix Price Description
-GPIB $830 GPIB
-RS232 830 RS232
-MATH 830 Math option
-REM 631 Remote controls
-AK04 414 Alarm option
-ROL 27 Roll chart drive
-REROL 247 Chart reroll
Mutually exclusive.
*
To order options: Add suffix to model
number and appropriate amount to price.
Ordering Example: RD3722-12-GPIB,
$1955 + 830 = $2785.
communications*
communications*
Input Type Range Accuracy
DC V 1 mV to 200V FS of range and 0.5% µV
R ±(0.05% of rdg. + 1°C)
S ±(0.05% of rdg. + 1°C)
B ±(0.05% of rdg. + 1°C)
K ±(0.05% of rdg. + 0.5°C)
T/C E ±(0.05% of rdg. + 0.5°C)
J ±(0.05% of rdg. + 0.5°C)
T ±(0.05% of rdg. + 0.5°C)
N ±(0.1% of rdg. + 0.5°C)
C ±(0.1% of rdg. + 1°C)
J DIN (L) ±(0.05% of rdg. + 0.5°C)
T DIN (U) ±(0.05% of rdg. + 0.5°C)
KP vs. Au7/Fe ±(0.05% of rdg. + 0.5°C)
Pt 100 (1 mA) ±(0.05% of rdg. + 0.2°C)
RTD Pt 50 (1 mA) ±(0.05% of rdg. + 0.3°C)
Ni 100 ±(0.05% of rdg. + 0.2°C)
±(0.05% of rdg + 0.03%
MOST POPULAR MODEL HIGHLIGHTED!
To Order (Specify Model Number)
Model No. Price No. of Pens Inputs Printer
RD3722-12 $1955 1 T/C, V No
RD3722-15 1948 1 T/C, RTD, V No
RD3722-22 2819 2 T/C, V No
RD3722-25 2977 2 T/C, RTD, V No
RD3722-32 3770 3 T/C, V No
RD3722-35 4000 3 T/C, RTD, V No
RD3722-42 4704 4 T/C, V No
RD3722-45 5008 4 T/C, RTD, V No
RD3721-12 2394 1 T/C, 1 mV Yes
RD3721-15 2720 1 T/C, RTD, V Yes
RD3721-22 3397 2 T/C, V Yes
RD3721-25 3565 2 T/C, RTD, V Yes
RD3721-32 4583 3 T/C, V Yes
RD3721-35 4840 3 T/C, RTD, V Yes
RD3721-42 5744 4 T/C, V Yes
RD3721-45 6085 4 T/C, RTD, V Yes
Comes complete with power cord, paper, 1 pen per channel, ribbon for printer version, an 8 K
memory card for storing setup parameters only, Lithium battery and operator's manual. If data
storage is desired, purchase the RD-MC256 memory card separately.
Ordering Example: RD3721-25, 2-pen recorder with printer, accepts thermocouple, RTD and
voltage inputs, plus RD3720-RC, black ribbon cassette, RD3720-01 and RD3720-02, red and
green pens, and RD3720-ZFP, Z-fold charts, $3565 + 28 + 16 + 16 + 16 = $3641.
OCW-3, OMEGACARESMextends standard 2-year warranty to a total of 5 years ($350),
$3641 + 350 = $3991.
Accessories
Model No. Price Description
RD3720-ZFP $16 1 each, Z-fold charts, 250 mm x 20 m (10" x 65'),
RD3720-RP 18 1 each, roll charts, 250 mm x 20 m each* (10" x 65')
RD3720-01 16 3 red pens, channel-1
RD3720-02 16 3 green pens, channel-2
RD3720-03 16 3 blue pens, channel-3
RD3720-04 16 3 brown pens, channel-4
RD3720-RC 28 Black ribbon cassette
Roll paper requires “-ROL” option on recorder.
*
S-48
standard
Remember to
Order Extra Pens
and Paper!
S
One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | info@omega.com
EPG05
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