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Rosemount 3490 4-20 mA and HART® Compatible Control Units

Specifications

Models	3491 - Standard Control Unit 3492 - Differential Control Unit 3493 - Logging Control Unit
Mounting style	Wall mount or Panel mount
Power options	115 ⁄ 230Vac or 24Vdc
Current Input	4-20mA (Earth referenced in control unit) or HART digital communications (Rev. 5)

Display	Dot matrix LCD, 32 x 122 pixels, back lit
Relays	5 SPCO (SPDT), 5A at 240V ac
Trigger Inputs	2 voltage-free contact closures
Update rate	5 times per second
Materials of construction (IP-rated wall mount)	Polycarbonate enclosure and cover.
Materials of construction (panel mount)	Polyphenylene oxide enclosure and polycarbonate cover.
Materials of construction (NEMA4X-rated wall mount)	Polyester and monel fastening.
Ambient temperature	-40 °C to +55 °C (-40 °F to + 131°F)
Certification	CE-mark, ATEX, IECEx, CSA, or UL

Documentation

The Rosemount 3490 Series of wall and panel mounted control units provide comprehensive control functionality for any 4-20 mA or HART® compatible transmitter. A back-lit display gives clear visual indication of the measured value and status of all inputs and outputs. The 3490 provides an intrinsically safe 24V dc power supply to the transmitter. Five relays are provided and are fully field programmable to perform a wide variety of control, fault indication or alarm duties.

Tough weatherproof wall mount enclosure for internal or external mounting
Accepts any 4-20 mA or HART compatible input
Five field adjustable control relays
Bright local display of measured value
Pre-programmed with tank shapes, flow algorithms and pump control routines to simplify configuration

Features & Benefits

3490 Series Features and Benefits

Tough weatherproof wall mount enclosure for internal or external mounting
Accepts any 4-20 mA or HART compatible input
Pre-programmed with tank shapes, flow algorithms and pump control routines to simplify configuration
A 20 point strapping table facility is provided for non-standard applications
Real time clock allows energy saving routines and pump efficiency calculations
5 voltage free SPDT relays for alarm and control duties
4-20 mA 12-bit isolated current output proportional to calculated value
Supports two voltage free contact closure inputs

Applications

The Rosemount 3490 Series of wall and panel mounting control units provide comprehensive control functionality for any 4-20mA or HART compatible transmitter.