Chell Instruments
 
DHI Calibration Solutions for Pressure and Flow
DH Instruments, Inc (DHI) was founded in 1980 with one objective, to provide superior calibration solutions through innovative technology, first rate service and uncompromising metrological integrity. For the company's first eight years, this objective was pursued through the full service distribution of an outstanding line of pressure calibration products manufactured by Desgranges et Huot, Paris, France. In 1988, building on the resources of a full service distributor and drawing on more than 50 years of broad based management experience in high end pressure metrology, DHI began the in-house development and production of its own unique products. These efforts resulted in a first generation of successful pressure calibration instruments. In 1992, the company diversified into mass flow metrology introducing a revolutionary low mass flow calibration system. By 1997, second generation products were being introduced and DHI ended its distribution activities to concentrate solely on its rapidly growing range of original products.

These renowned products are now exclusively available in the UK from Chell Instruments, appointed distributor, who will also provide after sales support and service.

A brief summary of these products is given below. Follow the various links for more detailed information.

Pressure controller/calibrators offering fully automated pressure measurement and control in compact and rugged design.
High Pressure Gas Pressure Controller / Calibrator. 1 to 100MPa (150 to 15000 psi).
PPCH™, is a pressure generator/controller/calibrator for liquid pressure operation from 1 to 200 MPa (150 to 30 000 psi)
Reference pressure monitors combining very high accuracy measurement capability and a variety of unique features in a compact and easy to use design.
Air Data veresion of the RPM. Covers the absolute and differential pressure ranges of typical air data instruments.
COMPASS for PPC/RPM provides the missing link between automated hardware components and a fully automated calibration system.
Gas pressure balances from 5 kPa to 7 MPa gauge and absolute modes, accuracies to ±20 ppm.
Add-on accessory automates mass handling over the complete piston gauge pressure range...

FPG8601 Piston Gauge : Automated Calibration System for Very Low Pressure

Mass flow calibrator from less than 1 sccm to more than 100 slm with accuracies to +0.2% of reading in a variety of gases.
Oil pressure balances to 500MPa.
 

Chell Instruments