Hurtwood Ltd
Building Energy and Environment

Copyright © 2016, Hurtwood Ltd


Hurtwood manufacture a range of retrofit controls products for older and obsolete BMS’s.  We have developed our flagship Satrofit IO product to provide an easy and low cost swap-out route for Satchwell BAS and Sigma systems while our Staefa Retrofit product does the same for the old Staefa AS1000 RSM system by replacing the main NRUA/A to NRUD/A controller cards.

A flexible and easy to service and commission system.

Aside from the retrofit applications, our IO is also a very powerful and compact product suitable for new BMS installations. Our PC-based Satrofit commissioning tool is also available that uses a direct connection via a local port on the card.  This allows the IO cards and the field sensors and outputs such as actuators and variable speed drives to be commissioned by a non BMS engineer before integration into the master BMS controller, reducing installation costs and time.


Satrofit I/O Cards

CUH Plant Room Installation

Modbus Communications

Our products communicate using the Modbus protocol, a robust, proven and open automation standard, to a wide range of compact and intelligent master controllers.  These include:

Our Satrofit product is retailed directly through Hurtwood or from a series of distributors.  For details, contact us or see the website.


Satrofit Terminal Controller


Staefa Retrofit

Satrofit AUNC 16UI & 16UO IO cards plug directly into the BAS and Sigma UNC 696 or 796 racks and read all the pre-existing Satchwell sensors.  The output cards can drive the Satchwell 8 latching relay cards.

Take a look at our video (click on YouTube logo) to see how easy it is to update your old system with the new Satrofit cards.

Hurtwood Universal Output Card Hurtwood Universal Input Card

The Satrofit SRC-AUNC-6-6-3 controller is a direct physical replacement for the popular Satchwell IAC 420 controller.  The controller has a number of pre-set control strategies for building services such as small boiler houses and fan-coil units.  The selection of and set-up of these programs can be carried out through the Satrofit tool.  Additional control programs for bespoke applications can be provided on request by Hurtwood.

The Staefa Retrofit 48IO cards plug directly into the housing for the original NRUA/A to NRUD/A Integral RSM series of controllers and have connectors for the ribbon cables of the original NTIM and NTOM modules.  They can read all the pre-existing Staefa sensors.

Like the Satrofit cards, Staefa Retrofit cards are a powerful and cost effective input/output card and a wide variety of ribbon cable connected input and output modules are available. Variations to suit particular customers’ requirements and to meet any retrofit application can be built on demand. Just get in touch.

Hurtwood also manufacture replacement modules for the NTIM and NTOM racks allowing the Staefa system to be maintained and added to for many decades to come.