TELEVAC MV2A Instruction Manual

The Fredericks Company

MV2A Thermocouple Controller

Instruction Manual

The Fredericks Company - Televac

2400 Philmont Avenue

Huntingdon Valley, PA 19006

web: www.frederickscompany.com

email: [e-mail]

tel: [phone]

fax: [phone]

CONTENTS LIST OF FIGURES

Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.1 Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.3 Operating Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.4 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.5 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Electrical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 Set Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.4.1 Setting 1 mTorr Calibration Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.4.2 Setting 1 Torr Calibration Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.5 Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

List of Tables

1 Operating Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2 Controller, Cable, and Sensor Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

List of Figures

1 MV2A Dimensional Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 MV2A Electrical Connection Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 MV2A Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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1 INTRODUCTION

1 Introduction

1.1 Disclaimer

All information in this manual is subject to change without notice. The Fredericks Company assumes
no responsibility for inaccuracies in product specifications or any liability arising from product use.
Please contact Televac at [e-mail] or call 215-947-2500 with comments or questions.

1.2 Description

The MV2A is a thermocouple vacuum sensor controller with a range of 1 × 10−3Torr to 20 Torr. It
utilizes a Televac thermocouple vacuum sensor, part number 2-2100-10 or 2-2126-0YY. It has a red,
three-digit, seven segment LED display that displays pressure in units of mTorr and Torr. The MV2A
has 2 set points relays, and a 0-5 Volt analog output.

1.3 Operating Specifications

Table 1: Operating Specifications

Operating Range 1 × 10−3to 20 Torr
Communications N/A
Programmable Set Points 2
Set Point 1 Relay
Set Point 2 Relay
Analog Output 0 to 5 V Linear
Supply Voltage 90 V to 135 V AC, 60 Hz
Calibration Medium Dry air or nitrogen
Overpressure Sensor-dependent
Analog Output Resolution 12 bits
Operating Temperature 0◦C to 50◦C
Storage Temperature −20◦C to 60◦C
Bakeout Temperature Sensor-dependent
Response Time ≤ 1 second
Accuracy

1 mTorr to 10 mTorr

10 mTorr to 500 mTorr

500 mTorr to 1 Torr

Analog Output

Standard Resolution

1 mTorr to 500 mTorr

500 mTorr to 1 Torr

1 Torr to 20 Torr

Display Readable Distance 8 m (26 feet)

±1 mTorr
±10%
±20%
±10 mV

1 mTorr
10 mTorr
1 Torr

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1.4 Safety Information 1 INTRODUCTION

1.4 Safety Information

START BY READING THESE IMPORTANT

SAFETY INSTRUCTIONS AND NOTES

In these instructions the word “product” refers to the MV2A 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 email address found in the footer of this manual.

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

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.



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.

The MV2A qualifies as a Safety Extra-Low Voltage (SELV) device. As such, it represents little to no
hazard concerning electrical shock or burns.

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 for service and repair to ensure that safety
features are maintained. Do not use this product if it has unauthorized modifications

1.5 Dimensions

Figure 1: MV2A Dimensional Drawing

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2 SETUP

2 Setup

2.1 Installation

Each MV2A is designed to be used in conjunction with a 2A sensor. The 2A sensor can be mounted
in any orientation. The sensor should be mounted close to the area where vacuum measurement is
desired. Each 2A sensor has a key that only allows the octal end of the MV2A cable to mate with the
sensor in the proper orientation. Rotate the octal end of the MV2A cable until the correct alignment is
obtained and the MV2A cable is able to slide onto the 2A sensor. Connect the RJ14 end of the MV2A
cable into the port on the back of the MV2A labeled "input". It is recommended that the ground con­nector on the cable is also connected to the port on the back of the MV2A labeled with the universal
earth ground symbol.

Try to avoid connecting the 2A sensor to the vacuum chamber by long or narrow piping as this may
affect the accuracy and response time of the unit. Avoid mounting the unit near a heater within the
chamber as this may affect the measurement accuracy. Excessive vibration of the sensor may affect
accuracy and decrease the life of the sensor. Exposure to oils and other contaminants will decrease
the accuracy and decrease the life of the sensor. Do not expose the sensor to corrosive gases.

2.2 Electrical Information

The MV2A has several connectors located on the rear of the unit. A connection diagram is provided
for convenience.

Figure 2: MV2A Electrical Connection Information

Label Description
1 AC Input
2 SP1 C
3 SP1 NC
4 SP1 NO
5 SP2 C
6 SP2 NC
7 SP2 NO
8 Analog Output + (0 to 5 V)
9 Analog Output – (0 to 5 V)
10 Earth Ground
11 Sensor Input

2.3 Set Points

The instrument is equipped with dual set points which are adjustable from the front panel. These two
set points are control relays, which can be found on the rear of the controller. These can be wired to
be normally open or normally closed.

To adjust the set point values, hold either SP1 or SP2 while toggling the UP or DOWN buttons
to the desired value on the screen.

Note: the factory settings for set points are 100 mTorr and 200 mTorr for SP1 and SP2, respectively.
To restore these default values, hold SP1, SP2, UP, and DOWN simultaneously.

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2.4 Calibration 2 SETUP

2.4 Calibration

The MV2A controller provides two calibration points to maximize the accuracy of each sensor. These
should be set at 1 mTorr and 1 Torr. Maximum accuracy will utilize a 2A sensor and a NIST traceable
reference gauge co-located on a vacuum chamber. A controlled leak of dry nitrogen is necessary for
calibration.

2.4.1 Setting 1 mTorr Calibration Point

Pump the vacuum chamber down to below 1 × 10−4Torr. Using the leak control on the vacuum
system, adjust the pressure in the chamber until the reference gauge reads 1 mTorr. Then press and
hold the SP1 and SP2 buttons on the MV2A. While holding the set point buttons, press the Up and

Down arrows until the MV2A reads 1 mTorr.

2.4.2 Setting 1 Torr Calibration Point

After setting the 1 mTorr calibration, use the leak control on the vacuum system to adjust the pressure
in the chamber until the reference gauge reads 1 Torr. Then press and hold the SP1 and SP2 buttons
on the MV2A. While holding the set point buttons, press the Up and Down arrows until the MV2A
reads 1 Torr.

2.5 Analog Output

The MV2A contains a 0-5 V linear analog output for use with voltmeters, programmable logic con­trollers or other data acquisition devices. To convert the analog output signal to a pressure, follow the
equation below.

Pressre (Torr) = Votge × .02

Figure 3: MV2A Analog Output

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3 Part Numbers

Table 2: Controller, Cable, and Sensor Part Numbers

MV2A Controller 2-7900-071
2A Sensor 1/8” NPT Nickel-Plated Brass 2-2100-10
2A Sensor Stainless Steel 1/8” NPT 2-2126-001
2A Sensor Stainless Steel NW16 (DN16 ISO-KF) 2-2126-030
2A Sensor Stainless Steel NW25 (DN25 ISO-KF) 2-2126-031
2A Sensor Stainless Steel 8-VCO Male 2-2126-040
2A Sensor Stainless Steel 8-VCO Female 2-2126-041
2A Sensor Stainless Steel 8-VCR Male 2-2126-042
2A Sensor Stainless Steel 8-VCR Female 2-2126-043
2A Sensor Stainless Steel 4-VCR Male 2-2126-044
2A Sensor Stainless Steel 4-VCR Female 2-2126-045
2A Sensor Stainless Steel 1.33” CF (DN16 ISO-CF-F) 2-2126-050
2A Sensor Stainless Steel 2.75” CF (DN40 ISO-CF-F) 2-2126-052
3 ft Cable 2-9800-076
10 ft Cable 2-9800-077
20 ft Cable 2-9800-078
35 ft Cable 2-9800-079
50 ft Cable 2-9800-080
VacuMini 2A Sensor 2-2100-102
NASA 2A Miniature Sensor 2-2100-31

3 PART NUMBERS

Contact Fredericks Company for further sensor flange types and cable lengths.

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