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Teledyne 2002 instruction manual Operation, 16 mA, 1000mTorr ⎠, I channel 1 = 4mA + P Torr * ⎜

Models: 2002

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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.

149-072011 Model 2002 Vacuum Gauge

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Teledyne 2002 Operation, 16 mA, 1000mTorr ⎠, I channel 1 = 4mA + P Torr * ⎜, I channel 2 = 4mA + P mTorr * ⎜

Contents

I S O 9 0 0 TELEDYNE HASTINGSINSTRUMENTS MODEL VACUUM GAUGEBy this manual, protection provided By the equipment man be impaired Refer to accompanying documentsIf Equipment is not used in the manner specified any obligation to provide notification of change or intent to changeTable of Contents 1.2. Model 2002 Sensors 1.1. Features1. General Information 1.3. Model 2002 Control Unit1.4. Specifications 2.1. Receiving Inspection 2. Installation2.3. Transducer Installation 2.2. Quick StartPanel Mount Instructions 2.4. Control Unit Installation2.5. Initial Operation Transducer Cable Attachment3. Front Panel Operation 3.1. Overall Functional Description3.2. RUN Mode A/D Speed AdjustMantissa exponent Scientific Notation3.3. High and Low Set Point Modes 3.4. CAL ModeZero Coefficient Adjustment Midrange Coefficient Adjustment Atmosphere Coefficient Adjustment3.5. GAS Mode Default Calibration Restoration 3.6. UNITS Mode4.2. Analog Output 4. Rear Panel Description4.1. Remote Zero Input V = EXP + 6 + MANT −Voltage to pressure conversion example 4.4. Power Entry Module 4.3. TTL OutputsModel Rear Panel Detail Bridge-Power SENSOR CONNECTORBOARD CONNECTOR I/O CONNECTOR5. Theory of Operation 5.1. Piezoresistive SensorDual Sensor Emodiment V dT 1 dV= −⎜ K = ΔRL LEs = Κ ∆Τ Αm/L 5.2. Pirani SensorEt = Es + Er + Eg Er = σεTh4-Ta4AsEg = Kg DT As/Dx Eg = arLt273/Th1/2Th-TaAgP5.3. Dual Sensor Operation Page 22 of6.1. RS-232-E Interface Specifications 6. Communications Option Board6.1.2. For RS-485 Half Duplex - 2 wire 6.2. Interface Connector Pin Assignments for RS-2326.1.1. Interface Connector Pin Assignments for RS-485 COMMAND SYNTAXInterrogation Commands Parameter Modification CommandsPage 25 of Calibration Adjustment Commands Page 26 ofReset / Restore Commands Device StatusPage 27 of 7.1. Relay Board Specifications 7.2. Relay Connector Pin Assignment7. Relay Interface Option Board Model Rear Panel Detail Connector Pin Assignments8. 4-20 mA Interface Option Board 8.1. 4-20 mA1024 Torr ⎠ 8.2. Operation16 mA 16 mA9.1 0-10V Interface Connector Pin Assignmets 9. 0-10V Interface Option Board= PTorr V channel1 = PmTorr V channel210.Troubleshooting Guide 11.2. Non-Warranty Repair Policy 11.WARRANTY11.1. Warranty Repair Policy ATTENTION REPAIR DEPARTMENT12.Diagrams and Drawings Page 35 of149-072011 Model 2002 Vacuum Gauge Page 36 of 149-072011 Model 2002 Vacuum GaugeModel Outline Dimensions Page 37 of149-072011 Model 2002 Vacuum Gauge Page 38 of 149-072011 Model 2002 Vacuum Gauge

8.2.Operation

16mA

I (channel1) = 4mA + (P(Torr))* ⎜

1024Torr ⎠

I (channel2) = 4mA + (P(mTorr))* ⎜

1000mTorr ⎠