ADTECH
Analog-Digital Technology, Inc.
Typical Applications
Resistance Bulb
Alarms
Model Nos. RBA 174 Single,
RBA 175 Dual
The Adtech RBA series temperature alarms accept all standard 2, 3, & 4 wire
resistance bulb sensors, such as platinum, nickel, and copper, and provide relay
contact outputs.
Differential temperature measurement is provided at no additional cost.
The basic input range is 1.5 to 1,000 ohm resistance spans and the output
contacts are rated at 10 amps, 30 VDC, or 250 VAC resistive.
When ten-turn setpoint dials are utilized, sensor linearization for platinum and
nickel sensors is provided as an exclusive feature. This provides precise
adjustment(s) 0-100% to actual temperature span.
The RBA 174 single alarm has a DPDT output. The RBA 175 dual alarm has a
SPDT output per each setpoint and an optional DPDT output per setpoint.
Integral dual color LEDs provide green indication for normal conditions and red
indication on alarm per setpoint, independent of relay coil power.
The alarms are furnished as standard with the relay power fail-safe (i.e., relay coil
energized) regardless of high- and/or low-alarm configurations. You may specify
the relays to be non-fail-safe (i.e., relay coil de-energized) or any combination at
no extra cost and are mounted in the "wide-line" (2.75
"
wide) enclosure.
The RBA 174 and RBA 175 are supplied with a fixed dead band of 0.5% of span
as standard. They are optionally supplied with adjustable dead band of 1 to 100%
of input span. Ten-turn calibrated dials are offered as an option for both the
setpoint and dead band at a nominal extra cost.
An adjustable time delay of 1-30 seconds may also be provided as an option. This
is useful to prevent false alarms due to signal transient noise-interference.
•Direct contact input(s) to
annunciators, lights and
horns
•Machinery and process
temperature alarm/
protection
•Level alarm using resistor
tapes
•On/off temperature control
•Sensor interface to
computer/programmable
controllers
•High/low temperature
alarm
•HVAC applications
•Differential temperature
detector alarm
Features
•Direct Resistance Bulb Inputs: Platinum, nickel, copper;
two, three, or four wire
•Input Spans: 1.5 ohms to 1,000 ohms--standard
•Lead Wire Compensation: Three and four wire-type sensors;
constant current excitation
•Repeatability: ±0. I% of span
•Universal Relay Action: Fail-safe or non-fail-safe for high
and low trip
•Contact Status: LED indication: green--normal; red--alarm
•Adjustable Dead Band: 1-] 00% of input span--optional
•Adjustable Time Delay: 1-30 seconds--optional
•Calibrated Set Point and Dead Band: Ten turn--optional
Represented by:
ADTECH
Connections/Dimensions
Analog-Digital Technology, Inc.
3750 Monroe Avenue
Pittsford, New York 14534-1302
Phone: (716) 383-8280
Fax: (716) 383-8386
E Mail: adtech@adtech-inst.com
Web site: http://www.adtech-inst.com
Input/Output
Performance
Power
Mechanical
Information subject to change without notice.
Printed in U.S.A. A060
Ordering Information
• Model number
• Input sensor type and
temperature coefficient
• Input temperature range
(Degrees "F" or degrees "C")
• Differential or non-differential
• Linearized or non-linearized
• High- and/or low-relay action
• Input/output/control(s) options
• Prime power with option no.
• Housing and miscellaneous
options
Please refer to the Housing and/or
Option Section for more specific
and detailed information.
Input Signals
* Resistance Bulb Sensor: Two, three, or
four wire types and differential sensors.
* 1.5 to 1,000 Ohms Resistance Span:
Standard.
Platinum, nickel, and copper RTDS.
*Zero
suppressionlelevation to 85% of
span.
Option Number Description
O 26 & O 28 Setpoint ten-turn calibrated dials: single and dual
O 27 & O 29 Dead band ten-turn calibrated dials: single and dual
O 30 & O 31 Adjustable time delay: single and dual
O 34 DPDT output: dual
O 40 & O 41 Hermetically sealed relays: single and dual
O 46S & O 46D Adjustable dead band: single and dual
H I0 & H 11 Thin- and wide-line conduit mounting plate and terminal cover
H 13B, H 14B, H 15B NEMA 4, 7, and 12 enclosures
Electrical Classification: General purpose
Connection: Barrier terminal strip (3/8" spacing, No. 6 screws)
Controls:
Multiturn trip set control(s), optional dead band & time delay controls & internal zero & span controls
Mounting: Surface mounting standard. See Housings Section for options.
Weight: Net Unit: 2.6 pounds (1.18 kilograms); Shipping: 3.0 pounds (1.36 kilograms)
115VAC:50/60 Hz, 0.7 PF (Standard)
12 VDC: Isolated (Option P8)
24 VDC: Non-isolated (Option P1)
24 VDC: Isolated (Option P2)
Repeatability: ±0.1% of span
Trip Point Stability: Zero and span
±0.0040/%/°F typical, ±0.01%/°F maximum
for a 50°F change from ambient
* Trip Adjustment: 0-100% of span
continuously adjustable; blind set:
infinite resolution.
Fixed Dead Band: Factory set at 0.5% of
span
Output Signals
Standard: RBA 174 one set DPDT contact**
RBA 175 two SPDT contacts**
**
Rated 10
amps at 30 VDC
or
250 VAC resistive.
Optional: DPDT dual alarms: (Option O 34).
Hermetically sealed 2 amp at 28 VDC or 115
VAC resistive: (Option O 40 single,
Option O 41 dual).
Note: With Option O 34, the "wide-line"
(2.75" wide) housing is supplied.
48 VDC: Isolated (Option P3)
125 VDC: Isolated (105-140 VDC) (Option P4)
230 VAC: 50/60 Hz, 0.7 PF (Option P5)
Note: All units 3 watts maximum, and a
±
10% power variation unless noted.
* Adjustable Dead Band: 1-100% of span
continuously adjustable; blind set: infinite
resolution.
Power Supply Effect: ±0.05% for a
+10% power variation
Isolation: Input/output/power 1,500 VAC,
50/60 Hz, for AC & isolated DC powered units
Response Time: Less than 200 milliseconds
Temperature Range: 0° to 140°F (-18° to 60°C)
operating; -40° to 185°F (40° to 85°C) storage
Note: All accuracies are given as a percentage of span.
* Ten-turn dials:
±
0.5% accuracy,
±
0.05% resolution
Options
