TELEVAC MC 300 2A, MC 300 4A Instruction Manual

INSTRUCTION MANUAL

MC 300 2A & 4A

DUAL CHANNEL THERMOCOUPLE / CONVECTION

VACUUM MEASUREMENT INSTRUMENT

TELEVAC

A DIVISION OF THE FREDERICKS COMPANY

2400 PHILMONT AVENUE,

HUNTINGDONVALLEY, PA 19006

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# QTY ITEM DESCRIPTION

6

PARTS LIST

3

MOUNTING

KIT

1

2

4

1 1 MC300 Thermocouple, Convection, Measurement Instrument

2 1 Instruction Manual
3 3 Sensor Cables (sold separately)
4 4 Sensors (sold separately)
5 1 Mounting kit

6 1 AC Power Cable

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SECTION & TITLE

01. DESCRIPTION

02. SAFETY INSTRUCTIONS

03. PRINCIPLES OF OPERATION

04. INSTALLATION & OPERATION

05. ANALOG RECORDER OUTPUTS

06. MAINTENANCE

07. CALIBRATION

08. CALIBRATION VERIFICATION

09. TROUBLESHOOTING

10. DIMENSION

11. SPECIFICATIONS

12. UNPACKING & INSPECTION

13. WARRANTY INFORMATION

14. ORDERING INFORMATION

TABLE OF CONTENTS

PLEASE READ THIS MANUAL THOROUGHLY BEFORE USING THIS

INSTRUMENT. REPORT ANY PROBLEMS IMMEDIATELY.

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CHAPTER 1 TELEVAC

Description

The TELEVAC Series MC300 vacuum-measuring instrument is a combination sensor,
which incorporates various range options, as shown in the table below:

Range of Options

Model Range Sensors

MC300 2A 0 - 20,000 millitorr 2AThermocouple

MC4A 0 – Atmosphere 4A Convection

The 2A thermocouple gauge tube will monitor pressures between 1 millitorr

(1 micron) and 20,000 microns ).

The 4A convection sensor tube will monitor pressures between 1 millitorr (1

micron) and 999 Torr. (1 atmosphere = 760 Torr @ sea level ).

The vacuum measuring system consists of various gauge tubes, which sense the vacuum,
an electronics unit and interconnecting signal/power cables. The customer must supply
power at 115VAC 50-60 Hz. (220 Volt operation is a factory selectable option). The
measured vacuum is displayed on the front panel LED displays. (See figure 1)

The power cable, gauge tubes, relay outputs and output voltages of 0 to 10 VDC
connections are on the back panel. (See figure 2)

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CHAPTER 1 (cont) TELEVAC

Figure 2

Figure 1

The MC300 FEATURES

Large bright LEDs

Built-in self-diagnostics

Selectable Units (Torr, microns, mBar or Pascal)

Gas compensation (Argon/Air-Nitrogen)

Four process relays with individual assignable set points

Analog outputs for each sensor

Operator lockout switch

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CHAPTER 1 (cont) TELEVAC

Theory of Operation:

The MC300 is a microprocessor-controlled instrument utilizing modern data acquisition
techniques to achieve a high degree of accuracy at a reasonable cost.
The microprocessor in the instrument performs two basic tasks:

1. Controls the acquisition and conversion of all sensor data

2. Processes all operator interface inputs and requests
After power is applied to the instrument, the software initializes all of the circuitry
associated with acquiring and displaying sensor information then performs a self­diagnostic. If there are no errors detected, the MC300’s data acquisition process is
started. Both input channels are read periodically and a reading for each sensor is stored.
After several readings the data is averaged, then converted using the appropriate sensor,
units and gas compensation settings. Set point relays and the microprocessor controlled
Analog outputs are also updated at the same time. This method of averaging samples
results in a smooth and accurate transition from reading to reading.
Each sensor has its own conversion algorithm. The data conversion process always
occurs regardless of the instrument mode (operation set-up). However, during the set-up
mode the converted data is not sent to the display but the set-point relay control and
analog output operations continue to operate.
Whenever the instrument software is not processing sensor data for the displays or
recorder outputs, the Set-Up, Test/Operate and Up & Down (if enabled) buttons are
checked for operator interaction. The Set-Up button is used to sequence through all of the
operator settable parameters. Each depression of the Set-Up button may change the
function of the displays as well as the Up & Down buttons. Each time the Set-Up button
is pressed, the data from the previous level is stored in non-volatile memory to ensure
that the instrument’s gas compensation, units and set point parameters are preserved. This
information is used to restore the instrument’s configuration each time power is applied.
For simplicity, the Up & Down buttons are enabled and disabled at the proper time to
prevent the operator from entering an invalid value. In addition, each time an On Point is
adjusted, the corresponding Off point is verified to ensure that it is higher then the new
On Point. If lower, the Off Point is adjusted to be one increment higher than the new On
Point. In this instance both the On and the Off Point values are updated in the non­volatile memory.
When “GAS” is selected in SETUP, a correction is applied to the instrument readings to
compensate for the use of Argon as a gas instead of nitrogen/air. Both the displayed
readings and the set point calibrations are compensated as well as the linear thermocouple
and the linear by decade convection gauge recorder outputs at the back panel. Note,
however, that the “traditional” thermocouple, “linear” convection gauge outputs and ion
gauge outputs are NOT compensated.

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CHAPTER 2 TELEVAC

Safety Instructions

START BY READING THESE IMPORTANT SAFETY INSTRUCTIONS AND
NOTES collected here for your convenience and repeated with additional information at

appropriate points in these instructions.

These safety alert symbols in this manual or on the Product rear panel mean

In these instructions the word “product” refers to the MC300 and all of its approved parts
and accessories.

NOTE:

These instructions do not and cannot provide for every contingency that may
arise in connection with the installation, operation, or maintenance of this product.
Should you require further assistance, please contact Televac at the address on the title
page of this manual.

This product has been designed and tested to offer reasonably safe service provided
in it’s installed, operated and serviced in strict accordance with these safety
instructions.

Failure to comply with these instructions may result in serious personal injury, including
death, or property damage.

These safety precautions must be observed during all phases of operation,

installation, and service of this product.

Failure to comply with these precautions or with specific warnings elsewhere in

this manual violates safety standards of design, manufacture, and intended use of
the instrument. Televac disclaims all liability for the customer’s failure to comply
with these requirements.

cautions - personal safety, property damage or danger from electrical shock.
Read these instructions carefully.

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CHAPTER 2 (cont.) TELEVAC

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The service and repair information in this manual is for the use of Qualified Service
Personnel. To avoid shock, do not perform any procedures in this manual or perform any

Servicing on this product unless you are qualified to do so.

READ Instructions:

Read all safety and operating instructions before operating the product.

RETAIN instructions:

Retain the Safety and Operating Instructions for future reference.

HEED warnings:

Adhere to all warnings on the product and in the operating instructions.

FOLLOW instructions:

Follow all operating and maintenance instructions.

ACCESSORIES:

Do not use accessories not recommended in this manual as they may require a technician
to restore the product to its normal operation.

To reduce risk of fire or electric shock, do not expose this product to rain or moisture.

`

Objects and Liquid Entry – Never push objects of any kind into this product through
openings as they may touch dangerous voltage points or short out parts that could result in
a fire or electric shock. Be careful not to spill liquid of any kind onto the products.

Do not substitute parts or modify instrument.

Because of the danger on introducing additional hazards, do not install substitute parts or
perform any unauthorized modifications to the product. Return the product to Televac fo
service and repair to ensure that safety features are maintained. Do not use this product
if it has unauthorized modifications.

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