Dimensional Drawing —

Dimensions are nominal value in inches (millimeters referenced).

The Controller

The 937B controller is designed for versatility, reliability

and economy. The large, easy to read, liquid crystal display

provides readout for up to six sensors simultaneously.

The back lit LCD display, intuitive menus and simple push

button front panel, allows for ease in setup of the 937B.

The 937B, enables the use of any sensor card in each of

the sensor card slots. The 937B can be configured with

up to three hot or cold cathode type gauges, or three dual

sensor cards for a maximum of six gauge connections.

Set Points

Twelve independently adjustable set points are standard.

This allows for the automation of process related functions.

The set point values are nonvolatile and remain unchanged

after power down or power failure. They are easily viewed

and configured in the channel set up screen. The 937B

also includes an adjustable control set point that turns the

cold cathode or hot cathode gauges power off or on, at the

desired pressures, extending the sensor’s life.

Leak Test

The leak test mode includes a bar graph and variable

audible alert to assist in locating leaks within a system.

The function operates with the cold cathode, hot cathode,

Pirani, and convection sensors. By taking advantage

of differences in tracer gas sensitivity, this provides an

excellent tool for helping locate coarse system leaks.

Analog Output Signals

The controller provides analog output signals accessible

on the rear panel connector. Three types of analog signals

are available. Unprocessed analog signals are used to

provide the fastest response times. The logarithmic output

voltages are scaled so that 0.6 Volts equals one decade of

pressure. Combination output can be created by combining

20,000 Torr.

Digital Signals

In addition to analog outputs, the 937B communicates

digitally for direct computer communication with built in

connections for RS232 or RS485. A communication slot

in the 937B chassis accepts an optional Profibus DPV1

board. The 937B can communicate with a host computer

using either of these ports. Remote control of set points

and cold cathode high voltage disable are some of the

many features available with communications options.

Pirani Sensors

In Pirani-type sensors, vacuum measurement is based on

thermal conductivity of the gas. The sensor tube contains

a fine wire that is maintained at a constant temperature.

Heat transferred from the wire relates to the amount of gas

present and is used to indicate pressure. There are two

types of Pirani tubes that can be run on the 937B. Both the

standard and convection enhanced Pirani’s are shielded

and CE approved.

convection-enhanced Pirani gauge for over 35 years and

are used in thousands of vacuum processes to accurately

the highest level of accuracy and gauge-to-gauge

reproducibility, every Convectron gauge is individually

calibrated at the factory, thereby making controller

adjustment unnecessary.

Standard Pirani - Series 345

The Standard Pirani sensor will read continuously from

read as 200 Torr, 400 Torr, and Atmosphere. The sensor

has a greater signal output at the high vacuum end of its

range, providing an added half decade of reading, down to

The Pirani platinum filament ensures compatibility with

a wide array of process gases. Only UHV compatible

materials are exposed to vacuum. The 345 Pirani sensor is

shielded for use where CE marking is a requirement and

has a standard 9-pin D-sub connector.

Convection Enhanced Pirani - Series 317

The convection Pirani style sensor design enhances heat

transfer through convection at higher pressures. This

sensor will read continuously with full resolution from

above 100 Torr. A 250°C bakeable version is available

upon request.