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4

PENBERTHY 

MODEL MGT-362 LEVEL MEASUREMENT TRANSMITTER

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

8.  The NULL potentiometer is properly set as 

part of the factory calibration and should not 
require any further adjustment.

CAUTION

Should the NULL require adjustment; care must 
be taken to ensure that the potentiometer is not 
over-ranged. The NULL potentiometer should be 
set with the liquid in the vessel set to the 'zero' 
point. A digital voltmeter should be connected 
to test points TP1 (+) and TP2 (-). Slowly turn the 
NULL potentiometer so that the reading on the 
voltmeter approaches a reading of 0.0 volts. At 
some point (usually within 0.1 Volts) the reading 
on the meter will no longer respond to any 
adjustment of the NULL potentiometer. At this 
point, turn the NULL potentiometer back slightly, 
so that the potentiometer is at the threshold of 
meter response. The reading does not have to be 
exactly 0.00 Volts.

  Any additional adjustment of the NULL 

potentiometer beyond the point described 
above will decrease the available gain of the 
current loop and hinder proper calibration.

9.  Turn the OFFSET potentiometer (R14) 

clockwise so that the millimeter reads 4mA 
± 0.05mA. (See Figure 2)

10. Raise the liquid level to the highest possible 

level. For bench calibration place the 
float at the point on the sensing element 
corresponding to 100% level.

11. Turn the SPAN potentiometer (R15) 

clockwise so that the millimeter reads 
20mA ± 0.05mA. (See Figure 2)

12. Lower the float or calibration magnet to 

the 75%, 50% and 25% level. Verify that 
the output goes to 16mA, 12mA, and 8mA 
respectively.

13. Disconnect the power. Remove the 

voltmeter and the millimeter from the unit. 
Reconnect the positive (+) lead from the 
power supply to TB2 (+). (See Figure 2)

FIGURE 2

MGT-362 PCB Details for Wiring and Calibration

5 TROUBLESHOOTING

5.1 Introduction

Your Penberthy Model MGT-362 transmitter 
is designed to give you years of unattended 
service. However, failure of electrical equipment 
can occur. Sound maintenance practices 
require periodic inspection of the instrument to 
ensure it is in good working order.

WARNING

'Live' electrical circuits can ignite flammable 
gases. Be sure that the unit is properly grounded 
and that a suitable intrinsically safe barrier has 
been installed between the power supply and this 
unit. Failure to use a barrier can result in severe 
personal injury or property damage.

5.2 Test procedure

Follow the procedure in Section 4.1. If this 
doesn't solve the problem, go to Section 6.

Summary of Contents for PENBERTHY MGT-362

Page 1: ...n to the Penberthy Model MGT 362 level measurement transmitter The Model MGT 362 consists of a reed switch resistor network encased in a pipe sensor and an electronics assembly The electronics assembly is available in a watertight NEMA 4 and explosion proof NEMA 7 enclosure The Model MGT 362 is available in either integral or remote mount models The remote mount is required when the process temper...

Page 2: ...or Division 1 2 Class I Groups A B C D Class II Groups E F G Class III Type 4 When installed in accordance with control drawings For transmitter 18F52 009 Figure 5 For Model MGT 362R sensor 18J54 009 Figure 6 3 INSTALLATION 3 1 Unpacking Upon receiving the Model MGT 362 level transmitter check all components carefully for damage incurred in shipping If damage is evident or suspected do not attempt...

Page 3: ...ttach the positive lead from your loop power supply to TB2 and the negative lead to TB2 see Figure 2 3 The cable connecting the sensor and transmitter should not exceed 50 feet in length Beldon cable 85240 is recommended for connecting the sensor to the transmitter 4 SET UP 4 1 Calibration The Model MGT 362 is factory calibrated for the corresponding Multiview unit However if necessary the Model M...

Page 4: ...o that the millimeter reads 4mA 0 05mA See Figure 2 10 Raise the liquid level to the highest possible level For bench calibration place the float at the point on the sensing element corresponding to 100 level 11 Turn the SPAN potentiometer R15 clockwise so that the millimeter reads 20mA 0 05mA See Figure 2 12 Lower the float or calibration magnet to the 75 50 and 25 level Verify that the output go...

Page 5: ...you are having difficulty with your Penberthy Model MGT 362 transmitter contact your local Penberthy distributor You may also contact the factory direct at 956 430 2500 and ask for an applications engineer So that we may assist you more effectively please have as much of the following information available as possible when you call Model Name of the company from whom you purchased your transmitter...

Page 6: ... path seal off shall be installed within 18 in of enclosure OR REMOTE MOUNT Hazardous area Non hazardous area Field wiring A flame path seal off shall be installed within 18 in of enclosure If less than 36 seal off shall be installed half way in between enclosures NOTES 1 Case temperature can not exceed 100 C 212 F 2 Wiring to be in accordance with national electrical code NEC pertinent parts of t...

Page 7: ...EGRAL MOUNT REMOTE MOUNT NOTES 1 Equipment supplying intrinsic system must not produce more than 250 V DC or 250 V rms 2 Nominal power supply voltage 25 5 V DC 3 Use only one single or dual channel barrier per transmitter circuit 4 Loop wire distance not to exceed 1500 ft using C leads 60 pF FT L leads 0 20 µH FT For CSA use CSA certified safety barriers use diode return 1 2 s only MANUFACTURER MO...

Page 8: ...r maintenance of any product Responsibility for proper selection use and maintenance of any product remains solely with the purchaser and end user Penberthy is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co Emerson Automation Solutions Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co All other marks ...

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