TELEVAC MP4AR Series User manual

INSTRUCTION MANUAL
MP4AR Remote
Convection Gauge
Range: 1 x 10-3 Torr to 1 x 10+3 Torr
TELEVAC
A DIVISION OF THE FREDERICKS COMPANY
2400 PHILMONT AVE.
HUNTINGDONVALLEY, PA 19006

PARTS LIST
#
QTY
ITEM DESCRIPTION
1
1
4AR Remote Convection Electronics
2
1
Cable (specified at ordering)
3
1
Instruction Manual
4
1
Sensor
1
2
4
3
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8/15

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1
TABLE OF CONTENTS
SECTION TITLE PAGE
01. DESCRIPTION and INSTRUMENT OPERATION ……………………………………….2
02. SAFETY ……………………………………………………………………………………….3
03. PRINCIPLES OF SENSOR OPERATION …………………………………………………4
04. SENSOR OPERATION AND INSTALLATION ……………………………………………5
05. RECORDER OUTPUTS ……………………………………………………………………..7
06. MAINTENANCE ………………………………………………………………………………8
07. CALIBRATION ……………………………………………………………………………… .8
08. TROUBLESHOOTING …………………………………………………………………….…8
09. SPECIFICATIONS ……………………………………………………………………………9
10. DIMENSIONS ………………………………………………………………………………..10
11. UNPACKING AND INSPECTION ………………………………………………………….11
12. WARRANTY INFORMATION ………………………………………………………………11
PLEASE READ THIS MANUAL THOROUGHLY BEFORE USING GAUGE. REPORT ANY
PROBLEMS IMMEDIATELY.

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Description and Instrument Operation
The MP4AR series Remote Module provides a compact stand-alone measurement solution for
applications that do not require traditional panel-mounted instrument readouts. These modules
can provide local readout and control or can be interfaced directly with a PLC, chart recorder, or
data acquisition system. The MP4AR series of instruments use the time proven reliable and
rugged TELEVAC 4A Sensor, which can be changed in seconds. These instruments operate from
low voltage DC and are easily integrated into the largest process system with a minimal effort.
Likewise, the MP4AR Remote Gauge can be used as a small stand-alone vacuum measurement
solution.
Features
Wide range 1 x 10-3 Torr to 1 x 10 -3 Torr
Sensors can easily and quickly be replaced
if required
Compact & rugged self-contained package
Fast system control with one setpoint
CHAPTER 1 TELEVAC

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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
In these instructions the word “product” refers to the MP4AR 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.
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.
√ ACCESORIES – Do not use accessories not recommended in this manual as they may require
a technician to restore the product to its normal operation.
These safety alert symbols in this manual or on the Product rear panel mean
cautions - personal safety, property damage or danger from electrical shock.
Read these instructions carefully.
Failure to comply with these instructions may result in serious personal injury, including
death, or property damage.
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.
To reduce risk of fire or electric shock, do not expose this product to rain or moisture.
CHAPTER 2 TELEVAC

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CHAPTER 2 (cont.) TELEVAC
Safety Instructions (cont.)
`
Principles of Sensor Operation
The convection gauge measures absolute pressures by determining the heat loss from a thermocouple
heated to a constant temperature by a current source. A second thermocouple compensates for ambient
temperature changes and extends the vacuum measurement range above 2 Torr by measuring the
convection effects.
The convection sensor must be mounted vertically for accurate measurements. Sensors are available in
stainless steel or nickel-plated brass and can withstand 150-psi overpressure.
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 for
service and repair to ensure that safety features are maintained. Do not use this product
if it has unauthorized modifications.
CHAPTER 3

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SENSOR OPERATION AND INSTALLATION
1.0 Connect the gauge to the vacuum system. It must be mounted vertically with the stem side
down.
NOTE: DO NOT TURN INSTRUMENTATION WHEN MOUNTING ON A THREADED INSTALLATION
TO INSTALL, USE A WRENCH ON THE FLATTED PORTION OF THE SENSOR TUBE
2.0 Assure that there are no leaks.
3.0 Apply 24 DC volt power between pin # 3 (+) and pin # 4 (-) of the connector cable.
4.0 Configure output lines; pin # 5 (for linear 1 T or log 1000T output), pin # 8 (signal gnd) and pin # 7
(for non linear output). The table of voltage versus pressure is shown in chapter # 5. The linear
signal output is 10 volts at 1000 microns and decreases linearly to zero at zero microns. The non-
linear signal output is 10 volts at atmospheric pressure and decreases non-linearly to zero volts at
zero microns. If it is a log 1000T unit, the output decreases logarithmically from 6.0 volts at
1000Torr to zero volts at zero microns.
5.0 Pump down the vacuum system while observing the LED display and the signal voltage reading
on the output. (see chapter # 5 for output values)
6.0 While the pressure is above 1000 Torr the display will show “HI”. Below 1000 Torr the signal
output will correspond to values given in chapter # 5, depending upon chosen output. As the
pressure drops below 1 Torr the red “MICRONS” LED lights and the displayed readings now drop
from 990 down to zero while the linear output voltage drops correspondingly from 9.90 Volts to
zero.
7.0 The trip pressure for the setpoint relay can be displayed by pressing the “setpoint display” button
on the front panel of the instrument or by reading the Set Point voltage at pin # 9 of the cable
connector. The display will blink the reading until the button is pushed again or until it times out
automatically after 60 seconds. If the Set Point adjustment screw is turned to change the setting
the new value displayed will be retained in memory. The setpoint adjustment range is 0 to 1 Torr
for the units with linear recorder output and 0-1000 Torr for units with logarithmic recorder
outputs. The relay contact connections are as follows; to the common # 6, # 1, normally open,
and # 2, normally closed.
8.0 If the display shows “-1” or “LO” then the gauge is out of adjustment. With a known vacuum of at
least 1 X 10-5 Torr, adjust the “Zero” adjustment screw on the front panel.
9.0 With the sensor tube exposed to atmospheric pressure, the display reading should be near 760
Torr (which may vary with geographic location). Adjustment for the correct reading is done with
the front panel “ATM” settings. Make sure that the tube is vertical, with stem down.
SEE NEXT PAGE FOR GAUGE DIAGRAMS
CHAPTER 4 TELEVAC

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DIGITAL 4AMP4AR REMOTE
SENSOR OPERATION AND INSTALLATION (cont.)
PIN#
PIN OUTS
1
Relay normally open contact
2
Relay normally closed contact
3
+24 volt power
4
Power common
5
Log / Linear signal output
6
Relay common contact
7
Non-linear signal output
8
Signal return
9
Setpoint output
CHAPTER 4 cont. TELEVAC
Setpoint
Display
Potentiometer
Setpoint
Adjust
Potentiometer
LED
display
Zero
Adjustment
Potentiometer
Pin #s
LED lights
for
microns
Phillips
Head
screw
Atmosphere
Adjustment
Potentiometer
SET POINT
RELAY
“ON”

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4A (Logarithmic)
0
2
4
6
8
0.001 0.1 10 1000
PRESSURE (TORR)
VOLTS
4A (Logarithmic)
0
2
4
6
8
0.001 0.1 10 1000
PRESSURE (TORR)
VOLTS
Recorder Outputs
CHAPTER 5 TELEVAC
4AR (linear)
0
2
4
6
8
10
12
0200 400 600 800 1000
PRESSURE (microns)
VOLTS
4AR (linear)
0
2
4
6
8
10
12
0200 400 600 800 1000
PRESSURE (microns)
VOLTS
Non-linear & Logarithmic
Pressure
(TORR)
Voltage (non-
linear)
Voltage
Logarithmic
1 x 10-3
.01
0
5 x 10-3
.06
.70
2 x 10-2
.24
1.3
4 x 10-2
.45
1.6
6 x 10-2
.64
1.78
8 x 10-2
.82
1.9
.1
.98
2
.2
1.67
2.3
.5
2.99
2.7
.8
3.84
2.9
2
5.45
3.3
10
7.32
4
30
7.84
4.48
50
7.93
4.7
80
8.01
4.9
120
8.08
5.08
160
8.19
5.2
180
8.24
5.26
300
8.76
5.48
500
9.57
5.7
760
10
5.88
1000
10.22
6
LINEAR
Pressure
(microns)
Voltage
1
.01
5
.05
10
.1
20
.2
30
.3
40
.4
50
.5
60
.6
70
.7
80
.8
90
.9
100
1
150
1.5
200
2
300
3
400
4
500
5
800
8
1000
10
2000
13.5
4A (non-linear)
0
1
2
3
4
5
6
7
8
9
10
11
12
0.001 0.01 0.1 1 10 100 1000
PRESSURE (TORR)
VOLTS
4A (non-linear)
0
1
2
3
4
5
6
7
8
9
10
11
12
0.001 0.01 0.1 1 10 100 1000
PRESSURE (TORR)
VOLTS

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CHAPTER 7
CHAPTER 8
Maintenance
No maintenance is required beyond periodic replacement of a contaminated sensor. To replace the
sensor, remove the Philips head screw in the center of the instrument, then gently rock and pull off the
electronic assembly. Replace the old sensor with a new one, remount the electronics and replace the
Phillips head screw. DO NOT OVER TIGHTEN THE SCREW! Adjust the “ATM” screw for the proper
reading when the vacuum system is vented.
Calibration
All instrumentation is calibrated at the factory. No further calibration at the customer’s facility should be
required, unless the gauge tube is replaced. In this instance the “ATM” adjustment should be done. No re-
adjustment of the zero should be required unless it has been changed.
For a reliable recalibration at a later date, it is necessary to have a reference standard vacuum system
whose pressure is known to be accurate. For such a calibration, the instrument, sensor tube and cable
should be returned to the factory for re-certification. However, if the vacuum calibration verification must
be done at the customer’s facility, a knowledgeable electronics technician trained in vacuum calibration
should operate equipment of certifiable accuracy.
Troubleshooting
1. If display consistently displays “HI”, the atmosphere adjustment may be incorrect or there may be a
broken filament in the sensor. If a broken filament is suspected, check for continuity between pins # 4 &
# 8 and # 2 & # 6 on the sensor.
2. If the display constantly reads “LO”, the sensor may have become inoperative. Check for correct
reassembly after bake out.
NOTE: If, after doing some or all of the above, the units are still inoperative, return to the factory for
repair.
CHAPTER 6 TELEVAC

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Specifications
Measurement range Temperature
1 x 10-3 to 1 x 10+3 Torr Operating +15° to + 50°C
Bake out at 200°C (with electronics
removed)
Calibration Medium
Dry air or nitrogen Power
24VDC @ 100mA (customer supplied)
Materials
Stainless steel or nickel-plated brass Set point Relay
Form C contact
Overpressure 24 v.5 a rating
Indicator lamp provided
150-psi
Accuracy
Adjustment Potentiometers
+/- 1 micron 0 to 10 microns
Zero, Atmosphere, Setpoint
+/-10% of reading 10 microns to 10 Torr
Response Time for a Pressure +/- 20% of reading 10 Torr to 100 Torr
Change from 10-5 Torr to
Atmosphere +/- 10% of reading 100 Torr to 1000 Torr
< 500 milliseconds
CHAPTER 9 TELEVAC

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Dimensions
CHAPTER 10 TELEVAC

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Unpacking and Inspection
Before each unit is installed or operated, a quick inspection should be performed and the
following noted:
a. damage to the unit (scratches, nicks, dents, cracks, etc.)
b. missing: screws, switches or switch hardware
c. broken barrier strips, etc.
d. broken or loose components within instrument
Should any of the above problems be encountered, contact the factory immediately. Any
unauthorized repairs will void the warranty.
Warranty information
The Televac division warrants instruments and components to be free of defects in material and
workmanship for a period of one year after the date of shipment unless otherwise specified in
the quotation pr product literature. No salesman, Representative or agent of the Fredericks
Company, or its divisions is authorized to give any guarantee or warranty or make any
representation in addition or contrary to those stated herein.
other than those expressly stated herein, there are no other warranties of any kind, express
or implied and specially excluded but not by way of limitation, are the implied warranties
of fitness for a particular purpose and merchantability. It is understood and agreed the
seller’s liability whether in contract, in tort, under any warranty, in negligence or
otherwise shall not exceed the return of the amount of the purchase price paid by the
purchases and under no circumstances shall seller be liable for special, indirect,
incidental or consequential damages. The price stated for the equipment is a
consideration in limiting seller’s liability. No action regardless of form, arising out of
transactions of this agreement may be brought by purchase more than one year after the
cause of action has accrued, seller’s maximum liability shall not exceed and buyer’s
remedy is limited to either (1) repair or replacement.
CHAPTER 12
CHAPTER 11 TELEVAC