Method for verifying temperature transmitter on site

Abstract

The invention discloses a method for checking a temperature transmitter on site. The method comprises the following steps: in a production field, adding liquid into a constant-temperature kettle; the inductive probe of the temperature transmitter and the inductive probe of the handheld digital standard thermometer are put into the liquid in the constant-temperature kettle together; respectively recording temperature values displayed by the temperature transmitter and the handheld digital standard thermometer at different set temperatures; comparing the temperature value displayed by the temperature transmitter with the temperature value displayed by the handheld digital standard thermometer; if the error exists, the temperature value displayed by the temperature transmitter is adjusted; and re-installing the inductive probe of the temperature transmitter, and the like. The method for on-site verification of the temperature transmitter has the following beneficial effects that a worker does not need to dismount a data transmission line of the temperature transmitter, the temperature transmitter is sent to a verification department for verification, the labor intensity of the worker is reduced, the transportation cost is reduced, and instrument damage caused in the transportation process is avoided. In addition, the method is simple, convenient to operate and short in verification time.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas production in oil fields, and particularly relates to a method for calibrating a temperature transmitter on site. Background Art

[0002] With the continuous improvement of automation level, temperature parameters are currently collected remotely by temperature transmitters at various oil field production sites, thus reducing the labor intensity of staff and avoiding human errors in data collection. In order to ensure the accuracy of data collected by temperature transmitters, temperature transmitters need to be calibrated every year. During calibration, staff need to remove the sensing probe on the temperature transmitter from the temperature transmitter body and remove the data transmission line, and then send the temperature transmitter body to the calibration department for calibration. After the calibration, the calibrated temperature transmitter body needs to be retrieved and installed on site. Obviously, the process of disassembly, inspection, retrieval, and installation is complicated, which is not only time-consuming and labor-intensive, but also often causes damage to the temperature transmitter during disassembly, assembly, and transportation. Summary of the invention

[0003] In order to solve the above problems, the object of the present invention is to provide a method for calibrating a temperature transmitter on site.

[0004] In order to achieve the above object, the method for on-site calibration of a temperature transmitter provided by the present invention comprises the following steps performed in sequence:

[0005] 1) At the production site, put liquid in a constant temperature kettle;

[0006] 2) Place the sensing probe of the temperature transmitter and the sensing probe of the handheld digital standard thermometer into the liquid in the constant temperature kettle;

[0007] Loosen the connection joint between the sensing probe of the temperature transmitter and the temperature measuring hole of the pipeline, take out the sensing probe of the temperature transmitter from the temperature measuring hole of the pipeline, and then put the sensing probe of the temperature transmitter and the sensing probe of the handheld digital standard thermometer into the liquid in the constant temperature kettle;

[0008] 3) Set several different temperatures on the control panel of the thermostatic kettle, turn on the power of the thermostatic kettle to increase the temperature of the liquid, and when the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer are stable, record the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer at different set temperatures;

[0009] From low to high, set several different temperatures on the control panel of the thermostatic kettle. After the temperature values ​​displayed by the liquid in the thermostatic kettle at different set temperatures stabilize, observe the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer, and record the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer at different temperatures respectively.

[0010] 4) Compare the temperature value displayed by the temperature transmitter with the temperature value displayed by a handheld digital standard thermometer to determine whether there is an error in the temperature value displayed by the temperature transmitter;

[0011] At different set temperatures, compare the temperature values ​​displayed by the temperature transmitter with those displayed by the handheld digital standard thermometer, and calculate the difference between the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer to determine whether the temperature value displayed by the temperature transmitter exceeds the allowable error value.

[0012] 5) If there is an error, adjust the temperature value displayed by the temperature transmitter until it is consistent with the temperature value displayed by the handheld digital standard thermometer;

[0013] If the temperature value displayed by the temperature transmitter does not exceed the allowable error value, it means that the temperature value displayed by the temperature transmitter is qualified and no adjustment is required; if the temperature value displayed by the temperature transmitter exceeds the allowable error value, it means that the temperature value displayed by the temperature transmitter is unqualified and should be adjusted to make it consistent with the temperature value displayed by the handheld digital standard thermometer.

[0014] 6) Reinstall the sensing probe of the temperature transmitter;

[0015] Take out the induction probe of the temperature transmitter from the inner cavity of the constant temperature kettle and insert it into the temperature measuring hole of the pipeline, and finally tighten the connecting joint.

[0016] The method for on-site calibration of a temperature transmitter provided by the present invention has the following beneficial effects: the staff does not need to remove the data transmission line of the temperature transmitter, and the temperature transmitter is sent to the calibration department for calibration, which reduces the labor intensity of the staff, reduces the transportation cost, and avoids damage to the instrument caused during transportation. In addition, the method is simple, easy to operate, and the calibration time is short. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to specific embodiments.

[0018] The method for on-site calibration of a temperature transmitter provided by the present invention comprises the following steps performed in sequence:

[0019] 1) At the production site, put liquid in a constant temperature kettle;

[0020] The constant temperature kettle should have wireless charging, multi-speed constant temperature and explosion-proof functions. The inner cavity depth should be equivalent to the length of the sensing probe of the temperature transmitter, and the diameter of the kettle mouth should be slightly larger than the sum of the diameters of the sensing probe of the temperature transmitter and the sensing probe of the handheld digital standard thermometer, so as to ensure that the inner cavity of the constant temperature kettle can accommodate the sensing probe of the temperature transmitter and the sensing probe of the handheld digital standard thermometer to avoid shaking of the probe. At the same time, it can also minimize the temperature loss of the liquid in the constant temperature kettle.

[0021] 2) Place the sensing probe of the temperature transmitter and the sensing probe of the handheld digital standard thermometer into the liquid in the constant temperature kettle;

[0022] Loosen the connection joint between the temperature transmitter's induction probe and the pipeline temperature measuring hole, take the temperature transmitter's induction probe out of the pipeline temperature measuring hole, and then put the temperature transmitter's induction probe and the handheld digital standard thermometer's induction probe into the liquid in the thermostatic kettle. At this time, make sure that the thermostatic kettle is in a position that fully satisfies the temperature transmitter's induction probe and can freely enter and exit the thermostatic kettle's inner cavity without removing the data transmission line.

[0023] 3) Set several different temperatures on the control panel of the thermostatic kettle, turn on the power of the thermostatic kettle to increase the temperature of the liquid, and when the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer are stable, record the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer at different set temperatures;

[0024] From low to high, set several different temperatures on the control panel of the thermostatic kettle. After the temperature values ​​displayed by the liquid in the thermostatic kettle at different set temperatures stabilize, observe the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer, and record the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer at different temperatures respectively.

[0025] 4) Compare the temperature value displayed by the temperature transmitter with the temperature value displayed by a handheld digital standard thermometer to determine whether there is an error in the temperature value displayed by the temperature transmitter;

[0026] At different set temperatures, compare the temperature values ​​displayed by the temperature transmitter with those displayed by the handheld digital standard thermometer, and calculate the difference between the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer to determine whether the temperature value displayed by the temperature transmitter exceeds the allowable error value.

[0027] 5) If there is an error, adjust the temperature value displayed by the temperature transmitter until it is consistent with the temperature value displayed by the handheld digital standard thermometer;

[0028] If the temperature value displayed by the temperature transmitter does not exceed the allowable error value, it means that the temperature value displayed by the temperature transmitter is qualified and no adjustment is required; if the temperature value displayed by the temperature transmitter exceeds the allowable error value, it means that the temperature value displayed by the temperature transmitter is unqualified and should be adjusted to make it consistent with the temperature value displayed by the handheld digital standard thermometer.

[0029] 6) Reinstall the sensing probe of the temperature transmitter;

[0030] Take out the induction probe of the temperature transmitter from the inner cavity of the constant temperature kettle and insert it into the temperature measuring hole of the pipeline, and finally tighten the connecting joint.

Claims

1. A method for on-site calibration of a temperature transmitter, characterized in that: The method for on-site calibration of a temperature transmitter comprises the following steps performed in sequence: 1) At the production site, put liquid in a constant temperature kettle; 2) Place the sensing probe of the temperature transmitter and the sensing probe of the handheld digital standard thermometer into the liquid in the constant temperature kettle; Loosen the connection joint between the sensing probe of the temperature transmitter and the temperature measuring hole of the pipeline, take out the sensing probe of the temperature transmitter from the temperature measuring hole of the pipeline, and then put the sensing probe of the temperature transmitter and the sensing probe of the handheld digital standard thermometer into the liquid in the constant temperature kettle; 3) Set several different temperatures on the control panel of the thermostatic kettle, turn on the power of the thermostatic kettle to increase the temperature of the liquid, and when the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer are stable, record the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer at different set temperatures; From low to high, set several different temperatures on the control panel of the thermostatic kettle. After the temperature values ​​displayed by the liquid in the thermostatic kettle at different set temperatures are stable, observe the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer, and record the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer at different temperatures respectively; 4) Compare the temperature value displayed by the temperature transmitter with the temperature value displayed by a handheld digital standard thermometer to determine whether there is an error in the temperature value displayed by the temperature transmitter; At different set temperatures, compare the temperature values ​​displayed by the temperature transmitter with those displayed by the handheld digital standard thermometer, and calculate the difference between the temperature values ​​displayed by the temperature transmitter and the handheld digital standard thermometer to determine whether the temperature value displayed by the temperature transmitter exceeds the allowable error value; 5) If there is an error, adjust the temperature value displayed by the temperature transmitter until it is consistent with the temperature value displayed by the handheld digital standard thermometer; If the temperature value displayed by the temperature transmitter does not exceed the allowable error value, it means that the temperature value displayed by the temperature transmitter is qualified and no adjustment is required; If the temperature value displayed by the temperature transmitter exceeds the allowable error value, it means that the temperature value displayed by the temperature transmitter is unqualified and should be adjusted to make it consistent with the temperature value displayed by the handheld digital standard thermometer; 6) Reinstall the sensing probe of the temperature transmitter; Take out the induction probe of the temperature transmitter from the inner cavity of the constant temperature kettle and insert it into the temperature measuring hole of the pipeline, and finally tighten the connecting joint.