Multifunction Time Delay Relays REV-120, REV-114, REV-201M for Oil & Gas

When a Missequenced Start Costs More Than a Relay

Consider a compressor station where three motors must start in a defined sequence — each with a minimum inter-start delay — to prevent simultaneous inrush current from collapsing the busbar voltage. If those delays are hardwired using fixed-timer relays or analogue adjustments, a single technician error during commissioning or PM can send all three motors into simultaneous star contactor pull-in. The result: overcurrent, nuisance tripping, and in worst cases, contactor weld-on in a hazardous-area panel. The protection gap is not in the overcurrent relay — it is in the timing logic upstream of it.

Across oil, gas and petrochemical facilities, factory-automation sequences — conveyor belt staging, motor star-delta starting, HVAC damper control, process-pump interlocks, and irrigation/fire-water timing — depend on accurate, repeatable time delays. A relay that drifts, offers only one timing mode, or cannot be field-reprogrammed without rewiring creates real operational risk. This is the engineering problem that the Novatek Electro REV-120, REV-114, and REV-201M multifunction time delay relays are designed to solve.

Why Timing Errors Occur — The Engineering Root Cause

Analogue RC-based timer relays suffer from component drift with temperature — a significant liability in petrochemical environments where panel internal temperatures can swing between 15 °C at night and 55 °C during summer operation. A 10 % timing drift on a 5-second star-to-delta transition can mean the motor transitions while still within the starting current plateau, causing torque shock on the coupling and mechanical wear on the driven load.

Single-mode timers compound the problem. A panel designed around a pure on-delay relay cannot be repurposed for an off-delay interlock without rewiring. In a plant where shutdown sequences must be as carefully staged as start sequences — for example, allowing a cooling fan to run for 30 seconds after a furnace burner trips — single-mode devices create hidden control gaps.

Microprocessor-based timers with digital display and selectable operating modes eliminate both problems: crystal-controlled timing removes temperature drift, and software-selectable modes allow one device to cover on-delay, off-delay, cyclic, pulse, and star-delta functions without hardware changes.

Introducing the Novatek Electro Multifunction Time Delay Relay Range

Novatek Electro — ISO 9001:2015 and CE certified, based in Delhi, India — manufactures the REV-120, REV-114, and REV-201M as microprocessor-based, panel-mount timing relays engineered for industrial control panels across demanding process industries. All three models are DIN-rail and panel-mount compatible, operate on 220–240 V AC 50/60 Hz supply, and carry a 6 A output contact rating (SPDT, potential-free).

REV-120 — Multifunction Time Delay Relay with External Input

The REV-120 operates across ten selectable operating modes, including on-delay, off-delay, cyclic (intermittent), pulse (on trigger rising or falling edge), and a dedicated star-delta timer mode. The star-delta mode makes it the natural choice for motor starting panels — the relay independently manages the star contactor hold time and the transition pause before delta contactor pull-in, with no additional auxiliary relay required. The time range spans 0.1 seconds to 10 days across 10 selectable ranges, giving panel designers a single device that handles both sub-second pulse timing and multi-hour process delays.

Price: Rs. 1,900 per piece (ex-GST). GST @ 18% applicable extra.

REV-114 — Programmable Time Delay Relay with External Input and Display

The REV-114 extends the operating logic set to seventeen selectable algorithms, including on-delay, time delay when energising, periodic with on-delay, periodic with time delay when energising, and several advanced cyclic and pulse variants. The integrated digital display and front-panel control buttons allow in-situ adjustment and visual verification of the set time — essential in petrochemical panels where re-entry for parameter verification must be quick and unambiguous. The same 0.1-second to 10-day range applies, with 10 selectable time bands. Contact form is SPDT (2NO + 2NC), potential-free, rated 6 A.

Price: Rs. 2,050 per piece (ex-GST). GST @ 18% applicable extra.

REV-201M — Dual-Channel Multifunction Time Delay Relay

The REV-201M is the two-channel variant in the range, designed for commutation of 240 V AC 50 Hz as well as 24 V DC circuits with adjustable time delay. It supports seven operating algorithms: turn-on time delay, pulse relay 1, intermittent (cyclic) relay 1, star-delta operation relay, pulse relay 2, intermittent relay 2, and off-delay. The two independent channels in a single device are particularly valuable for star-delta starter panels — where star-channel and delta-channel timing logic can both be contained in one DIN-rail slot — and for HVAC control sequences requiring staggered start and stop of supply and return air fans.

Price: Rs. 2,833 per piece (ex-GST). GST @ 18% applicable extra.

Key Technical Specifications — Side by Side

Application Categories in Oil, Gas and Petrochemical

Conveyor Belt Sequencing

Bulk-material conveyors in petrochemical plants must start tail-to-head to prevent material pileup. A cascaded arrangement of REV-120 or REV-114 relays in on-delay mode staggers each belt motor start by a defined interval — typically 5 to 30 seconds depending on belt length — without PLC intervention. The same relays, reprogrammed to off-delay mode, allow head-to-tail sequential shutdown, ensuring all material is cleared before the tail belt stops.

Motor Star-Delta Starting

The REV-120 and REV-201M both carry a dedicated star-delta mode. In a 220–240 V AC panel, the relay manages the star contactor dwell time (typically 3–10 seconds for motors in the 5.5–75 kW range) and the transition pause before delta contactor energisation, reducing transition-transient current. The REV-201M's dual-channel design allows the star and delta timing logic to be combined in a single device, reducing panel wiring complexity.

HVAC and Ventilation Sequencing

Process-area HVAC panels in petrochemical facilities require staggered fan starts (to limit peak demand), post-shutdown purge runs (to clear residual heat), and damper-open confirmation delays before fan start. The REV-114's seventeen operating algorithms — including periodic-with-on-delay and on/off-delay modes — map directly onto these multi-step sequences within a single relay body.

Process Pump and Valve Interlocks

Pump start delays (waiting for valve-open confirmation), minimum-run timers (preventing pump short-cycling), and coolant-flow establishment delays before main process start all fall within the 0.1-second to 10-day time window of all three models. Cyclic modes support automatic drain-valve actuation on a timed schedule.

Fire-Water and Irrigation Timing

Jockey pump cyclic run-test timers, fire-water system weekly test sequences, and drip-irrigation zone timing in green-belt areas of large petrochemical campuses are all served by the cyclic and pulse modes available across the REV range.

Quick Selection Guide

Why Novatek Electro?

• ISO 9001:2015 Certified Manufacturing: Every unit is produced under a documented quality management system — relevant for vendor qualification in oil, gas and petrochemical projects where QMS certification of component manufacturers is often a procurement condition.
• CE Marked: Demonstrates conformity with applicable European directives; relevant for export panels and EPC contractors working on internationally financed projects.
• Made in India — Delhi: Manufactured domestically, supporting shorter lead times, local technical support, and availability through established distributor and panel-builder networks.
• 30+ Years of Product Engineering: The REV range reflects decades of field feedback from Indian industrial panel builders — the operating modes and time ranges are not theoretical; they are matched to real sequencing requirements encountered in process-industry panels.
• Accessible After-Sales Support: Direct technical support available for panel builders, OEM integrators, and consulting engineers through the contact channels below — not a generic call-centre response.

Frequently Asked Questions