ADG400 User Manual
Michell Instruments
1
INTRODUCTION
1
INTRODUCTION
The ADG400 is designed for use as part of a hygrometry calibration system. It is capable
of repeatable generation of dew points across a range of -80 °C...+20 °C, when used in
conjunction with the Michell Instruments PSD2 pressure swing dryer.
The generator is based on the volumetric mixing of dry and wet gases. It gives the
fastest response when changing between set points in comparison to other dew-point
generator technologies (such as two-temperature, two-pressure or a combination of
both).
The controller comes pre-programmed with a standard table of dew-point set points,
from -80 °C to +20 °C at 10 °C intervals. The table contains flow rates for each of the 5
MFCs, along with solenoid settings that determine if 1 or 2 stage mixing is used. A user
table is also provided allowing up to 13 user-defined setpoints to be stored.
There are 3 modes of operation: Manual mode for push-button selection of set-points,
Profile mode for automatic timed changing of set-points, and Remote mode for changing
of set-points via serial commands sent over the USB port for integration with customer
software. Further to this, the ADG HMI can be displayed and interacted with on a PC
connected via the USB interface.
The ADG400 is designed to be used in conjunction with a high accuracy reference
instrument such as a Michell Instruments S8000 RS.
1.1
Features
The key features of the ADG include:
•
Full-color touch-screen HMI
•
11-point factory-programmed dew-point setpoint table from -80 to +20 °C
at 10 °C intervals
•
13-point user programmable dew-point setpoint table
•
3 programmable 13-point automatic calibration profiles with customizable
timings
•
Change set points using serial commands via built-in USB port
•
Remote Access mode allows HMI to be operated using a connected PC
•
Temperature-controlled enclosure to ensure output stability and repeatability
