Manuals / Teledyne / Kitchen Appliance / Food Saver

Teledyne 2002 Operation, 16mA, 1024Torr ⎠, 1000mTorr ⎠, I channel1 = 4mA + PTorr* ⎜

Models: 2002

1 37

Page 29

8.2.Operation

The 4-20 mA output option board provides dual channel current output linearly proportional to the HPM 2002’s pressure reading. The first channel corresponds to the higher pressure range (0-1024 Torr). The second channel corresponds to the lower pressure range (0-1000mTorr). The equations below give the output currents for a given pressure:

⎛	16mA	⎞
I (channel1) = 4mA + (P(Torr))* ⎜		⎟

⎝	1024Torr ⎠
⎛	16mA		⎞
I (channel2) = 4mA + (P(mTorr))* ⎜			⎟

⎝	1000mTorr ⎠

Note that for both channels, the output is always between 4mA and 20mA. Specifically, when the pressure is below 1 Torr, channel 1 current will be approaching 4mA. Also, when the pressure is above 1 Torr channel 2 current will be saturated at 20mA.

Model 2002 Vacuum Gauge

Page 29 of 37

Page 29

Image 29

Teledyne 2002 Operation, 16mA, 1024Torr ⎠, 1000mTorr ⎠, I channel1 = 4mA + PTorr* ⎜, I channel2 = 4mA + PmTorr* ⎜

Contents

MODEL VACUUM GAUGE TELEDYNE HASTINGSINSTRUMENTS Refer to accompanying documents Manual Print HistoryIf Equipment is not used in the manner specified By this manual, protection providedTable of Contents 1. General Information 1.1.Features1.2.Model 2002 Sensors 1.3.Model 2002 Control Unit1.4. Specifications 2.3.Transducer Installation 2. Installation2.1.Receiving Inspection 2.2.Quick Start2.5.Initial Operation 2.4.Control Unit InstallationPanel Mount Instructions Transducer Cable Attachment3.1.Overall Functional Description 3.Front Panel OperationA/D Speed Adjust 3.2.RUN ModeScientific Notation Normal Operation3.4.CAL Mode 3.3.High and Low Set Point ModesZero Coefficient Adjustment Atmosphere Coefficient Adjustment 3.5.GAS ModeMidrange Coefficient Adjustment Default Calibration Restoration 3.6.UNITS Mode4.1.Remote Zero Input 4. Rear Panel Description4.2.Analog Output V= EXP = 6 = MANT −1Voltage to pressure conversion example Model Rear Panel Detail 4.4.Power Entry Module4.3.TTL Outputs Fig Dual Sensor Emodiment 5. Theory of Operation5.1.Piezoresistive Sensor = −⎜ 1 dVV dT K = ΔRL LEt = Es + Er + Eg 5.2.Pirani SensorEs = Κ ∆Τ Αm/L Er = σεTh4-Ta4AsEg = arLt273/Th1/2Th-TaAgP Eg = Kg DT As/Dx5.3.Dual Sensor Operation 6. Communications Option Board 6.1.RS-232-EInterface SpecificationsCOMMAND SYNTAX 6.3.Operation of the Serial Interface6.1.2. For RS-485Half Duplex - 2 wire Parameter Modification Commands Interrogation CommandsCalibration Adjustment Commands Device Status Reset / Restore Commands7. Relay Interface Option Board 7.1.Relay Board Specifications7.2.Relay Connector Pin Assignment 8. 4-20mA Interface Option Board Connector Pin Assignments8.1. 4-20mA Interference16mA 8.2.Operation1024Torr ⎠ 16mA9. 0-10VInterface Option Board 9.10-10VInterface Connector Pin Assignmets= PmTorr V channel2 = PTorr V channel110.Troubleshooting Guide 11.2.Non-WarrantyRepair Policy 11.WARRANTY11.1.Warranty Repair Policy Page 34 of 12.Diagrams and DrawingsModel 2002 Vacuum Gauge Page 35 of Model 2002 Vacuum GaugePage 36 of Model Outline DimensionsModel 2002 Vacuum Gauge Page 37 of Model 2002 Vacuum Gauge

8.2.Operation

16mA

I (channel1) = 4mA + (P(Torr))* ⎜

1024Torr ⎠

I (channel2) = 4mA + (P(mTorr))* ⎜

1000mTorr ⎠