AUMA SAREx 07.6 Explosion-Proof Modulating Actuator

Overview

AUMA SAREx 07.6 is the second SAREx frame, with 30 to 60 Nm tripping torque (S4-25 %) and up to 30 / 15 Nm modulating torque (S4-25 % / S4-50 %) on an F07 / F10 flange.

Seven Star LLC quotes the SAREx 07.6 as trusted AUMA supplier for Oman and the GCC, with documentation suited to ATEX project files. Our Muscat office supports consultants and EPC contractors in Sohar and Salalah. See also the SAREx series overview, the SAEx explosion-proof actuators and the AUMA SDL/SDG variable-speed actuator.

Operating Principle of the AUMA SAREx 07.6

The SAREx 07.6 is built for intermittent duty, S4-25 % and S4-50 % to class C, so it can follow a controller continuously within its starts limit of 1,200 per hour up to 45 rpm. Pulses start from 50 ms, and a reversal needs up to 260 ms at 4 rpm. AMExC or ACExC controls drive the actuator.

Engineering Design of the SAREx 07.6

For the SAREx 07.6, match the controller’s deadband to the 50 ms minimum pulse so the actuator does not hunt around the setpoint. With 30 Nm of modulating torque up to 45 rpm and 20 Nm above, check that the control-valve friction stays below these values, and verify the 22 to 24 kg weight against the valve’s support.

Connection follows the same pattern as the SAREx 07.2: an Ex plug/socket connector (KT), spring-clamp control terminals, IP68 enclosure and an optional 12.5 W heater.

Key Features of the AUMA SAREx 07.6

Data points that matter most when specifying the AUMA SAREx 07.6:

• A torque window of 30–60 Nm (S4-25 %); the S4-50 % ceiling is 40 Nm.
• Maximum modulating torque of 30 / 15 Nm (S4-25 % / S4-50 %).
• Output speeds of 4–90 rpm at 50 Hz, with starts graded by speed band.
• Handwheel diameter 160 mm, approximate weight 22 kg (4–22 rpm), 24 kg (32–90 rpm).
• Motor power of 0.03–0.40 kW at 400 V; pulse timing 50 ms (same direction); on reversal 260 ms at 4 rpm down to 60 ms at 90 rpm.

Selecting the AUMA SAREx 07.6 for Your Valve

The SAREx 07.6 doubles the torque capability of the 07.2 to 60 Nm (S4-25%) while retaining the F07/F10 flange and 160 mm handwheel. Its modulating torque is 30 Nm (S4-25%) and 15 Nm (S4-50%) up to 45 rpm, then 20 Nm and 10 Nm from 63 rpm to 90 rpm. Choose it when a small control valve needs more positioning force than the 07.2 offers, but a move to the F10-only 10.2 would be unnecessary.

Compared with the SAREx 07.2, the SAREx 07.6 doubles the trip ceiling from 30 to 60 Nm and the modulating torque from 15 to 30 Nm at 4 to 45 rpm. The step up to the SAREx 10.2 brings 120 Nm and a 200 mm handwheel.

AUMA SAREx 07.6 Modulating Torque and Starts by Speed

These are the modulating limits of the AUMA SAREx 07.6 by output speed, valid at nominal voltage and +40 °C. Tripping torque is adjustable up to 60 Nm (S4-25 %) or 40 Nm (S4-50 %). Illustrative calculation, not AUMA data: a control valve with 8 turns per stroke needs 86 s at 5.6 rpm, 15 s at 32 rpm and 8 s at 63 rpm for a full stroke.

Loop-tuning note: the SAREx 07.6 shares the 50 ms minimum pulse and the 260 to 60 ms reversal-pulse range of the 07.2, but offers higher modulating torque (30 Nm up to 45 rpm). For a loop that updates every few seconds, 11 to 22 rpm (130 to 90 ms on reversal) usually gives enough resolution without using more of the 1,200 starts per hour than necessary. Controllers should avoid reversing direction more often than the process requires.

Worked Sizing Example for the SAREx 07.6 (Illustrative Calculation)

A fuel-gas pressure control valve has a friction torque of 25 Nm. The SAREx 07.6 provides 30 Nm modulating torque at S4-25 % up to 45 rpm, but only 20 Nm at 63 to 90 rpm, so the slower speed bands are required. At 4 to 45 rpm the permitted 1,200 starts per hour support even demanding control loops, while at 63 to 90 rpm the limit is 900. This is an illustrative calculation, not AUMA data.

Motor and Electrical Data of the AUMA SAREx 07.6

4 speed points from AUMA’s separate electrical data sheet (S4-25 %, 400 V / 50 Hz), 0.03 to 0.40 kW; approximate values that are not part of the technical datasheet attached here.

Explosion Protection and Installation Notes for the AUMA SAREx 07.6

Standard ATEX markings of the SAREx 07.6 per AUMA: II 2G Ex db eb IIC T4 or T3 Gb, II 2G Ex h IIC T4 or T3 Gb and II 2D Ex tb IIIC T130 °C or T190 °C Db. Certificate: DEKRA 11ATEX0008 X. Confirm temperature class and zone on the nameplate.

Humidity of up to 100 % relative is permitted across the whole temperature range, and the standard ambient range is minus 30 °C to plus 40 °C or plus 60 °C. The certificate suffix X flags special conditions of use.

Industrial Applications

The AUMA SAREx 07.6 suits small to medium control valves in hazardous areas, including separator level control, fuel-gas pressure control and chemical-dosing control. Its 30 Nm modulating torque at S4-25% is sufficient for most small globe-type control valves.

In gathering stations and process skids across the Sultanate, this size is a common step above the 07.2. Seven Star LLC quotes the SAREx 07.6 with local technical support and genuine AUMA documentation for Oman and the GCC.

Technical Specifications

Key figures for the AUMA SAREx 07.6, taken from AUMA’s technical data sheet.

Neighbouring sizes and counterparts: AUMA SAREx 07.2 explosion-proof modulating actuator, AUMA SAREx 10.2 explosion-proof modulating actuator, AUMA SAEx 07.6 explosion-proof actuator and AUMA SAR 07.6 modulating actuator.

Request a Quote for AUMA SAREx 07.6

Send your RFQ for the AUMA SAREx 07.6 to Seven Star LLC, naming valve, torque and positioner needs. The datasheet can be downloaded here and every unit ships with warranty.