Alicat ISMC-NB IS-Max Intrinsically Safe Flow Controller

The Alicat ISMC-NB is an IS-Max intrinsically safe mass flow controller with a 100 SLPM full scale. The sheet lists its part number in the 100 SLPM row with a pressure drop of 17.1 PSID, 1/4 inch NPT female ports, an IP66 housing and a weight of about 6.0 lb (2.7 kg).

Controlled gas flow for hazardous areas

IS-Max devices are built for locations where an ignition risk must be excluded at the instrument. The ISMC sheet lists ATEX marking II 1G Ex ia IIC T4 Ga under certificate DEKRA 22ATEX0075X, IECEx certificate IECEx DEK 22.0078X, and a North American marking of Class I Div 1 Groups A-D T4, Ex ia, with certificate DEKRA 23CAUS40-127215, all for ambient -20 to +70 degC.

Inside, the performance follows the standard Alicat controller: 98 gases, 20 user mixes, a 10,000:1 control range and a normally closed valve. The sheet quotes accuracy of 0.8 % of reading plus 0.2 % of full scale for the 30 to 250 SLPM group, or 0.4 % plus 0.2 % with the high-accuracy option.

Key features as printed in the datasheet

• Marking II 1G Ex ia IIC T4 Ga (ATEX), Ex ia IIC T4 Ga (IECEx), Class I Div 1 (North America).
• IP66 enclosure, dust-tight and protected against strong water jets.
• Repeatability 0.2 % of reading plus 0.02 % of full scale at this size.
• RS-232 or RS-485 with ASCII and Modbus RTU, plus a 4-20 mA analog signal.
• DB-15 connector; power requirements per the safe-installation manual.

Technical specification

Performance data (ISMC sheet, 30 to 250 SLPM group)

Mechanical, electrical and certification data

Selection and ordering guide

Match the certificate to your zone: the ATEX and IECEx markings cover Ga (Zone 0) for Group IIC gases, and the North American marking covers Class I Division 1 groups A to D. Always read the certificate conditions marked with an X before installation.

IS-Max controllers must be supplied through an approved barrier or supply as described in the Alicat safe-installation manual, so plan the associated apparatus together with the instrument. Alicat also lists high-pressure, media-isolated and low-pressure-drop versions of IS-Max.

Documentation matters as much as the instrument in a classified area, so request the Alicat safe-installation manual and the certificates with the quotation and file them with the loop drawing. The sheet also names the Eaton 9493-PS-C11 as the supply used for the stated 17.1 PSID pressure drop, which is a useful reminder that pneumatic and electrical conditions are part of the rated performance. The standard controller is listed in the same family on this site for non-hazardous service.

Installation and operation notes

Install according to the Alicat IS-Max safe installation manual and the certificate conditions, with the intrinsically safe circuit wired through the specified barrier and kept separate from non-intrinsically-safe wiring. The sheet gives a mounting pattern of four 6-32 UNC holes and no orientation sensitivity.

A competent person should verify the loop and entity parameters before commissioning, and the unit should be tared with no flow.

Applications in Oman and the GCC

Controlled gas feeds in classified areas include analyser purge and sample gases, fuel and oxidiser dosing for research reactors, hydrogen and natural-gas test benches and pilot plants handling flammable gases. Selection of the apparatus remains a matter for your hazardous-area assessment.

Compatible accessories and related items

For the standard non-hazardous equivalent see the MC-100SLPM controller on this site.

Frequently asked questions

What is the ISMC-NB?

An IS-Max intrinsically safe mass flow controller with 100 SLPM full scale and 1/4 inch NPT female ports.

Which hazardous-area markings are listed?

ATEX II 1G Ex ia IIC T4 Ga, IECEx Ex ia IIC T4 Ga and Class I Division 1 Groups A-D T4.

What ingress protection does it have?

IP66.

Which signals does it use?

RS-232 or RS-485 digital with Modbus RTU, and a 4-20 mA analog signal.

Does Seven Star LLC act as an ALICAT distributor?

No. Seven Star LLC is not an ALICAT distributor; it is an independent Muscat-based supplier that quotes ALICAT products on request.

Documents and quotation

The official ALICAT datasheet for ISMC-NB is hosted on this page for download. Seven Star LLC is an independent supplier in Muscat; send your quantity and delivery location through the quotation form and we will quote this item. Please confirm the exact order code, ratings and approvals against the document before ordering. More related products: product category.