622C, 623F and 626C Unheated Absolute

Baratron® Capacitance Manometers

The 622C, 623F and 626C Baratron capacitance manometers

are unheated, and thus are the most economical of all of the

600 series family of products. They are available in Full Scale

pressure/vacuum ranges from 0.1 to 1000 Torr (and metric

equivalents) and are suited for many industrial, electronic,

and research applications. The 622C has a terminal block

electrical connector without relays, the 626C uses a 15-pin

D-subminiature electrical connector without relays, and the

623F product adds two (2) independently-adjustable trip

relays to control external equipment.

The 627F, 628F, and 629F are heated capacitance

manometers that are much less affected by ambient

temperature changes than unheated Baratron capacitance

manometers. Heating the sensor also reduces or eliminates

the possibility of process byproducts depositing inside the

manometer to cause drift, which can have a significant effect

on system availability and repeatability. They are available in

lower Full Scale pressure ranges than unheated products,

which permits their use in more demanding processes. All of

the models are internally regulated to their specified operating

temperature; no external controllers, cables, or sensors are

needed. The 627F and 628F operate at 45°C and 100°C

respectively, and have a 15-pin D-subminiature electrical

connector. They also have an option for “Heater Status” and

“At Temperature” LED indicators and relay contact. The 629F

can be configured to operate at either temperature, and

uses a 9-pin D-subminiature electrical connector for “drop-in”

compatibility with many competitive products. The 629F also

offers an optional external zero set capability, allowing its

zero to be set remotely – a major advantage in many process

tools that do not permit easy access to the capacitance

manometer. The 45°C 627F offers Full Scale pressure/

vacuum ranges from 0.02 to 20,000 Torr (0.026 mbar to 26.3

bar), and the 100°C 628F has pressure/vacuum ranges from

0.05 to 20,000 Torr (0.066 mbar to 26.3 bar).

627F, 628F, and 629F Heated Absolute

Baratron® Capacitance Manometers

These heated capacitance manometers are identical to the

627F and 628F Baratron capacitance manometers except

that they add two (2) internally-mounted, independently-

adjusted electromechanical relays that can be set to open

or close at any pressure from 0.1% to 100% of the product’s

Full Scale measurement range. These relays can be used

to control external equipment, such as isolation valves,

other high vacuum gauges (such as hot-filament ionization

gauges), drive motors, etc. They are available in Full Scale

measurement ranges from 10 to 1000 Torr (13 to 1333 mbar).

624F and 625F Heated Absolute

Baratron® Capacitance Manometers with

Integral Process Control Relays