Resistance Bulb Alarms ADTECH Analog-Digital Technology, Inc. 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. Model Nos. RBA 174 Single, RBA 175 Dual Typical Applications *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 Connections/Dimensions Input/Output 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. Performance Power 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. Repeatability: 0.1% of span Trip Point Stability: Zero and span 0.0040/%/F typical, 0.01%/F maximum for a 50F 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 * 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 140F (-18 to 60C) operating; -40 to 185F (40 to 85C) storage Note: All accuracies are given as a percentage of span. * Ten-turn dials: 0.5% accuracy, 0.05% resolution 115VAC:50/60 Hz, 0.7 PF 12 VDC: Isolated 24 VDC: Non-isolated 24 VDC: Isolated (Standard) (Option P8) (Option P1) (Option P2) 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. Mechanical Options 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. 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) Option Number O 26 & O 28 O 27 & O 29 O 30 & O 31 O 34 O 40 & O 41 O 46S & O 46D H I0 & H 11 H 13B, H 14B, H 15B Description Setpoint ten-turn calibrated dials: single and dual Dead band ten-turn calibrated dials: single and dual Adjustable time delay: single and dual DPDT output: dual Hermetically sealed relays: single and dual Adjustable dead band: single and dual Thin- and wide-line conduit mounting plate and terminal cover NEMA 4, 7, and 12 enclosures Analog-Digital Technology, Inc. 3750 Monroe Avenue Pittsford, New York 14534-1302 Phone: (716) 383-8280 Fax: (716) 383-8386 Represented by: ADTECH E Mail: adtech@adtech-inst.com Web site: http://www.adtech-inst.com Information subject to change without notice. Printed in U.S.A. A060