Omega TX91 manual Calibration Procedures Refer to Figure

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Calibration Instructions	4

4.3 Calibration Procedures (Refer to Figure 4-1)

Connect the calibration equipment according to Figure 4-1 or 4-2. The thermocouple wire (J, K, T, E) must be of the same calibration as the transmitter being calibrated. Make sure that the wiring polarities are correct. (Note that the RED thermocouple wire is NEGATIVE.)

To check or adjust the calibration:

1.Locate the Z (zero) and S (span) potentiometers.

2.Select, from Table 4-1, the correct mV values for the Z (zero) and S (span) adjustments that correspond to the Model Number. For example, for Model TX91-J2, the Z input is -0.885

19mV, and the S input is 4.906 mV.

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Contents User’sGuide Servicing North America Return Requests / Inquiries Introduction Calibration Instructions Introduction General DescriptionIntroduction TX91 Thermocouple Transmitter Introduction Introduction Straight line Approximation of Curve Features Models AvailableTX91 Models Available Model Number Description Unpacking Installation Mounting the TX91Assembly of the TX91 Transmitter Inside RT Mounting Track in inches TX90-BR Mounting Bracket in inches Mounting Track RT Bracket TX90-BR Wiring the TX91 Refer to Figure Wiring Diagram for the TX91 Potentiometers Calibration Instructions Equipment RequiredSet-up of Equipment Calibration Procedures Refer to Figure Calibration Instructions Calibration Set-Up Calibration Set-Up. Alternate Calibration Values for the TX92 Troubleshooting Guide Current rating on the power supplyTroubleshooting Guide Accessories Model No DescriptionSpecifications GeneralInput Intrinsically Safe Interconnection Diagram WARRANTY/DISCLAIMER Shop online at omega.com