Strip Chart Recorders
RD-87 Series
The OMEGA RD-87 Series strip chart recorders are offered in different models to record either
a J Thermocouple, Temperature, Temperature/Humidity, Voltage, Current, or a 4 to 20 mA
input  signal on a 100 mm (4”) wide strip chart, with a single pen. The temperature/humidity
model uses two pens. Pens are colored to maximize chart readability. All RD-87 models offer a
LCD display and user friendly controls. A full function alarm feature is provided on the RD-87
Series. The alarm can be set to sound an audible signal when the measured value(s) has
exceeded an upper or lower limit. Each limit is individually set from the front panel. A delay time
before the alarm is activated may be set by the user to prevent nuisance alarms caused by
short-term variations. Low power normally open relay contacts are provided to allow activation
of a remote alarm, phone dialer or annunciation.
Power is supplied through a 120 Vac 50/60 Hz plug-in adapter. External power may be supplied
from any 12 Vdc source such as automotive, marine, or other battery. Battery backup for up to
48 hours is featured to provide operation during temporary power loss.
Specifications (General)
Operating Ambient Temperature Range:		0 to 50๐C (32 to 120๐F)
Storage Temperature:		-18 to 50๐C (0 to 120๐F)
Primary Power:		115 Vac, 50/60 Hz adapter (220 to 240 Vac, 50 Hz optional)
Backup Power:		8 “AA” alkaline batteries (ordered separately)
Alternative Power:		12 V vehicle operation
Chart Strip Chart:		6m x 120mm (20’ x 4 ¾”), roll type
Effective Recording Span:		100 mm (4”)
Metric Paper Grid Lines:		Time line every 5 mm with markings every 20 mm; 50 minor and 10 major divisions labeled on a rotating basis, with 100 to 0, 10 to 0,        20 to -30, 50 to 0, 60 to -40
Standard Paper Grid Lines:		Time line every 0.25” with markings every 1”; 50 minor and 10 major divisions labeled on a rotating basis with 100 to 0, 60 to -40, 150 to 50, 250 to 0, 500 to 0
Remote Alarm Type:		Normally open, 48 Vac/Vdc, 0.1 A dry contacts
Remote Alarm Connections:		2, ¼” terminal (spade) lugs in battery compartment area
Chart Speeds:		½ cm/hour, ¼”/hour 2 cm/hour, 1”/hour 4 cm/hour, 2”/hour 8 cm/hour, 4”/hour 16 cm/hour, 8”/hour ½ cm/min, ¼”/min 1 cm/min, ½”/min 2 cm/min, 1”/min 4 cm/min, 2”/min
Chart Speed Accuracy:		+/-1%
Alarm Delay Range:		0, 10, 20, 60, 120 min
Display:		Alphanumeric LCD, 16 characters 2 line
RS232 Port Connection:		RJ11 (4 pin) connector in battery compartment area
RS232 Port Parameters:		Data transmitted as measured, 4800 baud, 8, N, 1
Mounting:		Vertical or horizontal, free standing or wall mounted
Dimensions:		235 x 184 x 50 mm (9.25 x 7.25 x 2”)
Weight:		1.1 kg (2.5 lb)
Power Consumption:		3.5 W max
The RD-87-TRH is a precision temperature, relative humidity and dew point recorder with a
Digital display. The RD-87-TRH is menu driven and all parameters are shown on a 2-line
Alphanumeric LCD display. A temperature/humidity probe with 6’ cable (2’ coiled) is supplied
With the unit to connect to an RJ14 (6 pin) connector located in the battery compartment area.
Specifications (RD-87-TRH)
Temperature Accuracy:				+/-1๐C (+/-2๐F)
Relative Humidity Accuracy:				+/-2% (0 to 95% RH)
Temperature Range:				-40 to 60๐C (-40 to 140๐F)
Relative Humidity Range:				0 to 100%
Dewpoint:				Calculated value
Probe Dimensions:				118 x 14 mm Dia. (4.6 x 0.55”)
Chart Ranges
๐C	๐F
-40 to 60	-40 to 60
-30 to 20	50 to 150
0 to 50	0 to 100