Model PMP-716 Handheld Pyrometer Operator s Manual Rev 1.2

Transcription

1 Model PMP-716 Handheld Pyrometer Operator s Manual Rev 1.2

2 Contents 1. Introduction Description Operating Principle Specifications Location Sensor Location Sensor Aiming One-Color Mode Two-Color Mode Utility Connections Operation Controls Set Parameters Status Information Calibration Communication Notes Environmental Temperature and Humidity Maximum, Average and Minimum Sampling Emissivity of Materials Two-Color Slope Coefficient Maintenance Regular Maintenance Returns of the PMP Dimensions P a g e 1

3 1. Introduction The Logika Technologies Two-Color Handheld Pyrometer, Model PMP-716, is primarily used in the metallurgical industry to measure the temperature of high speed wire rod, hot rolled steel, molten metal and slabs/billets. Pyrometers are able to look into a process and measure the target temperature from a distance, thus providing an accurate reading while eliminating problems associated with contact measurements. Dual wavelength Infrared pyrometers are able to overcome application challenges such as targets with a small cross-section, variable emissivity, dust, water or other interfering media between the target and the pyrometer. Accurate temperatures can be obtained even when the target is 90% obstructed. The PMP-716 uses a visible laser to assist in aiming and a microprocessor to set up parameters like emissivity, slope, response time, sampling mode etc. It also has an interior ambient temperature compensation unit, which allows the instrument to work in temperatures of 0~50 C (32~122 F). PM-716 is operated by a 9V 6LR61 battery. It also has real time data storage capacity which can save up to 1000 data points. 2. Description 2.1 Operating Principle This two-color (colorimetric) infrared pyrometer senses two adjacent infrared wavelengths emitted by the target using a laminated photosensitive detector. By measuring the infrared energy emitted from the target, the pyrometer calculates the ratio of these wavelengths to determine the target temperature. The primary advantage of Logika s Two-Color Infrared Pyrometer over thermocouple temperature measurements is that the pyrometer directly and instantaneously measures the target temperature rather than inferring it based on the temperature of the atmosphere surrounding the target. The advantages of the Logika PMP716 two-color pyrometer vs. a single color pyrometer include: Overcomes optical fouling or interfering media between the target and the detector, such as dust, dirt, smoke, and water vapor to yield accurate temperatures. P a g e 2

4 Automatically compensates for changes in target emissivity or varying distance from the target to detector. The target does not need to fill the detector s field of view to accurately measure the target temperature, allowing flexibility of pyrometer location and target position variability. An accurate measurement may be made with as little as 10% of the pyrometer field of view used. Notes: The energy from spectral radiation increases with higher temperature. These curves do not intersect. The spectral radiation has higher energy at all wavelengths. Each curve has one peak, and these peaks move towards shorter wavelengths as the temperature increases. (Color shift) In blackbody radiation, the emitted energy is only dependent on absolute temperature. In one-color pyrometer, a single reading is taken and the temperature is derived from the radiation energy. This works under the following conditions: If the emissivity is known and constant The object fills the entire field of view There is no interference from smoke or dust. Two color systems measure the ratio of two readings and calculate the temperature from the ratio rather than the absolute value of readings. This minimizes the effects of emissivity, optical interference and partial views of the target. P a g e 3

5 If the object remains at a stable temperature, the ratio of the radiation energy remains constant. When the target temperature varies, the two wavelength ratio will remain the same. However, the slope of the ratio change differs when measuring different objects (like metal and non-metal), so a two-color slope coefficient is needed for correction. 2.2 Specifications Measured range 700 o C o C (1292 o F o F) Sensor Two-color laminated silicon infrared photocell Field of View One-color mode: D/S=90:1 D is the distance between pyrometer and the target S is the target diameter. See Figure 3.1 for more details. Two-color mode: No restriction for field of view. The target size can be much smaller. If temperature is greater than 900 C, the maximum signal attenuation ratio can be 95%. Focal Range 0.5m to Accuracy ±0.75% full scale at ambient 23 C ±5% (73 F ±9%) and humidity of 35% to 75% Repeatability ±2 C (±3 F) Wavelengths One-Color: 0.75 ~ 1.1µm Two-Color: 0.75 ~ 1.1µm/1.1 µm Response time 100 ms Display: LCD with backlight Modes: Real-Time: 0.1 ~ 1.0s. At 1.0s it will average over a second Maximum (Peak): 0 ~ 999.9s Minimum(Valley): 0 ~ 999.9s Average: 0 ~ 60.0s Output: RS232: 9600, N, 8, 1 Power Input: One 9V 6LR61 battery AC/DC adaptor, DC input range 9-24V P a g e 4

6 Alarms: Ambient: Aiming Laser: Internal Clock: Memory: Storage temperature Housing: Size: Weight: Adjustable high or low temperature alarm shows on display and output via RS232 Operation temperature 0 ~ 50 C (32 ~ 122 F) Humidity 10 ~ 95%, no condensation Deviation to reading at 23 C by ambient temperature: -Two-Color Mode: 6 C(11 F) -One Color Mode: 3 C(5 F) Visible red 650 nm <3mW Class IIa Lithium battery up to 5 years life 1000 Data points, historical data checkable -20 ~ 50 C (-4 ~ 122 F) Cast aluminum enclosure Enclosure: 230 mm L x 200 mm H x 70 mm W (9 L x 8 H x 2.75W) 1.4 kg (3lbs) 3. Location 3.1 Sensor Location The Logika PMP-716 Pyrometer should not be used above a heat source for extended periods of time. Avoid direct exposure to water vapor or excessive dust or smoke The Logika PMP-716 should be used close enough to the target to allow enough infrared energy to reach the detector in order to provide a strong signal, but far enough from the target to minimize the amount of heat that reaches the enclosure s electronics. Use Figure 3.1 to determine the PMP-716 Pyrometer s field of view based on its distance from the target. Only the intended target should be seen inside the field of view. Other infrared energy sources such as rolls, other wire or billets could interfere with accurate readings. Example: The pyrometer measures the temperature of a 5 mm steel wire with adjacent wires 5 mm on each side of the target. Use Figure 3.1 to determine that the pyrometer may be centered on the target wire and placed up to 1500 mm away from the target wire line (15 mm total clearance from interference from other target wire lines). P a g e 5

7 Figure 3.1: Pyrometer Distance Graph 3.2 Sensor Aiming Use the pyrometer s visible aiming laser to properly align the PMP-716 with the target. Typically, the pyrometer should be centered on the target. At the same time, adjust the detection spot by aiming laser to avoid interfering sources of infrared energy, including reflection of hot metal or sunlight. 3.3 One-Color Mode One-Color mode can be used to measure the average temperature in an area. The focal range of the instrument is 0.5m ~ and the distance can be infinite as long as the measured area is large enough. When selecting one-color mode, the object should completely cover the visual field; usually 20% larger than the visual field. This mode can be used for objects with level surfaces (no bending), with a viewing angle within 30 to the target s surface. This surface should be physically and chemically stable (not in the process of oxidation, gasifying or liquefying). The view to the object must also be free of airborne particles and obstacles. When the background temperature is higher than the measured temperature, One-Color mode can be used as long as the target fills the entire field of view. P a g e 6

8 3.4 Two-Color Mode Figure3.2 One Color Mode Temperature Accuracy Utilized when: Measuring small objects Dust, vapor or fog in the environment Measuring distance changes Part of the object is obscured. Two-Color temperature measuring mode measures the max temperature in an area regardless of the size of target. Since the two sampled signals will vary at the same rate, the ratio between the two signals will not change. Two-Color mode permits the measurement angle to be smaller than 45. When the background temperature is higher than the target temperature, Two-Color mode is not recommended. 4. Utility Connections P a g e 7

9 DC Power Plug RS-232 Plug The unit uses a 9V non-rechargeable 6LR61 battery. Remove batteries if the unit is inactive for an extended period of time. It can also be operated with a 9-24VDC, >200mA power supply with polarity protection and instantaneous over-voltage protection. When supplied from an external source, the unit automatically disconnects the battery and runs continuously in External Power Mode. The Communications plug allows the user to upload readings to a computer. Battery compartment Battery Compartment P a g e 8

10 5. Operation 5.1 Controls The PMP-716 Pyrometer s Control Panel is located at the rear of the enclosure. Battery Status: Black means OK. White means Replace. Scan is Scan Mode Recall is Data Recall Mode 2C=Two-Color 1C=One Color Slope 1.00 means Slope=1.0 in Two-Color Mode ε=0.99 is emissivity in Time HH:MM:SS Date MM/DD/YY Real Time Temperature in C/ F LAL=Low Alarm Limit HAL=High Alarm Limit Blank=No Alarms Average=1200 is average value of Temperature. MAX is Maximum, MIN is Minimum Button function: - Laser : turns the aiming laser ON/OFF. - Sys Press once: system information Press twice: instrument calibration setup - Recall : toggles between SCAN mode (running) and DATA Mode (replay) when pressed. It is also used as an exit when modifying numerical parameters - Enter : confirms the selection while in the parameter list. If pressed while in SCAN mode, it stores the current reading. If pressed while in RECALL, it will display the most recently saved reading. Pressing it a second time gives the option of deleting all saved readings or returning to SCAN mode. P a g e 9

11 - Set : steps through five pages of setup parameters. While on a parameter page, use the UP and DOWN arrow keys to select a parameter, press Enter button to change it if it is a toggle type parameter or Recall if it is a numerical parameter. Continue to click the Set button till the RUN screen is again displayed. The changes will then be saved to the EEPROM. - button moves the cursor up or increases the selected value - button moves the cursor down or decreases the selected value. In SCAN Mode, this button will toggle between 1C (One-Color Mode) and 2C (Two-Color Mode). The instrument will return to its default mode as selected in the parameters when power is cycled. - Power button turns the pyrometer on and off. Scan mode Press Recall, toggle SCAN/RECALL In SCAN mode, press ENTER can save the data. Data N0-N999, total saved 1000 data After 1000 data, Save function is disabled, all data must be erased to restore this function. In SCAN mode, press to switch 1C/2C Recall mode Press Recall, change to RECALL mode. Now the time is still changing, it is in RECALL idle mode. Press ENTER and change to RECALL run mode. Press and to look up the number of saved data. P a g e 10

12 Recall mode changes to SCAN mode In Recall mode press ENTER Press and to adjust the cursor location, either select delete all the data or EXIT Press ENTER to exit 5.2 Set Parameters Press Set button, enter parameters setup menu. Press and to adjust the cursor location Press ENTER to select the parameter, and use and to adjust the setup value Press RECALL to EXIT Parameter 1 - One-Color/Two-Color Operation: Toggles between 1 Color and 2 Color measurement. Also changes by pressing Parameter 2 - Emissivity: Only applies to One-Color Operation. See chart for typical emissivity settings. Emissivity coefficient 0.01, Reading 1 C. Parameter 3- Slope Coefficient: Only applies to Two Color Operation. Range from , increments Slope 0.001, Reading 1.2 C. Parameter 4 - Display: Toggles between Celsius and Fahrenheit. Parameter 5 - Sample Mode: Choose between Max, Average and Min. Parameter 6 - Sample Time: Max temperature: set the time 0.1~999.9s Min temperature: set the time 0.1~999.9s Average value temperature: set the time 0.1~60.0s, The response time for average value is the time which the signal rises to 95%. Default is =1.0s. P a g e 11

13 Parameter 7 - Real Time Display Interval: The internal sample time is 0.1s. The setup range for the real time display is from 0.1 to 1.0s. If set to 1.0s, the displayed value is the average over the last ten readings (0.1s each). Parameter 8 - Power Off Time: Default power off time is 10 minutes. Parameter 9 - Light On/Off: LCD Backlight ON/OFF. Setup takes effect after the power is OFF/ON. Parameter 10 - Upper Alarm: HAL (High Alarm Limit) will be seen on the LCD display if the temperature reading is higher than the setup value. Default is 1600 C. Parameter 11 - Lower Alarm: LAL (Low Alarm Limit) will be seen on the LCD display if the temperature reading is lower than the setup value. Default is 700 C. Parameter 12-2C Energy Reduction: Allowed signal reduction value in two-color mode. Setting range is 0~95%. When value >95%, it shows OFF, and the function is off. Default is=95%. See chart below. 2C Energy Reduction is a threshold for verifying the validation of the measured temperature. After the target temperature is calculated by the pyrometer, it calculates each wavelength s emissivity at this temperature. For each wavelength, the 2C energy reduction (100% Emissivity value) should not be lower than the set value. If either one is higher than the set value, the LEDs display the lower limit temperature of the pyrometer. This function is only used in two-color mode. The setup range is 20%-100% and the default setup value is 95%. If the attenuation ratio is set greater than 95%, this function will shut down; and again, the lower limit temperature will be displayed. For example, if the pyrometer is used to detect the temperature of tungsten filament of a light bar, usually the temperature is higher than 1500 C (2732 F). The tungsten filament (target) diameter is very small at 2mm, so the emissivity would be very low. According to Figure 5.6, if the temperature is greater than 900 C and target size is 2mm, the 2C energy reduction should be set to 95%. This means that as long as the emissivity value for each wavelength signal is not less than 5%, the calculated temperature is valid. In this case, the two-color mode, can still accurately calculate the temperature. In single color mode, it would be very hard to get an accurate target temperature in this situation. P a g e 12

14 Target size (Diameter) Accurate measurement with Energy Reduction value 2mm-10mm 95% 95% 10mm-30mm 90% 95% 30mm-100mm 80% 95% >100 mm 70% 70% Simplified measurement with Energy Reduction value Parameter 13 - Real Time Clock/Calendar: Hour = 0 ~ 23 Minute = 0 ~ 59 Year = 2002 ~ 2099 Month = 01 ~ 12 Date and Day 01 ~ 31, Mon ~ Sun Press Enter, then to Update Time to save new settings. The clock is maintained by a high capacity Lithium battery: BR2330H2A, 3V, 255mAh Under normal working conditions, the battery should last more than five years. P a g e 13

15 5.3 Status Information Press Sys button once and it will display system information Ambient Temperature: C= C, F= F One-Color signal energy from 16-bit A/D Two-Color Signal Ratio Battery voltage 9V Battery life and replacement Battery life is determined by the status of the pyrometer. If the laser and backlight is on, the pyrometer can work continuously for about 10 hours. When the power is OFF, the current leakage is 1uA. When the battery voltage is low, the battery symbol changes to empty. In this situation, all the parameters in EEPROM are locked and can t be set until the battery is replaced. 5.4 Calibration The instrument arrives calibrated to a Black Body Standard that is traceable to NIST (National Institute of Standards and Technology). The user may re-calibrate it to own in-house standards. Press Sys twice, it will display next calibration menu Press Recall to exit. P a g e 14

16 Location Cursor One-Color Span Coefficient. Range 0.20 to 2.0. Default=0.30 Two-Color Span Coefficient. Range to Two-color zero-point compensation coefficient, setting range ~ and default is < ±0.10. Restores all three above to their factory defaults. Manufacturer Test environment and conditions Ambient temperature 23±5 C (41±9 F) Relative humidity 35 ~ 75% Atmospheric pressure 86kPa ~ 106kPa (12.5 PSI ~ 15.4 PSI) Blackbody Temperature range 500 C ~ 1600 C (932 ~ 2912 F) Emissivity coefficient Diameter 50mm Measurements taken at 1m distance from the blackbody The instrument should be recalibrated annually. During calibration, the surface temperature of the blackbody is required to be stable and the blackbody oven tested by a Type B platinum rhodium 30 / platinum rhodium 6 thermocouple or other standard thermocouple. Set the one-color emissivity coefficient at , two-color slope at as follows: One-Color span coefficient Setting range 0.20~2.00, default =1.00, adjustment step 0.01, if coefficient 0.01, temperature displayed 1 C. Calibration is done at above 2/3 of the instrument measurement range, like 1200 C(2192 F). Adjust the blackbody to 1200 C, set PM716 to one-color mode and compare the actual temperature of the blackbody with the displayed temperature, adjust one-color span coefficient and make them equivalent. Two-Color Span Coefficient Setting range ~ 1.300, default =1.000, adjustment increments 0.001, if coefficient 0.001, P a g e 15

17 temperature displayed 1.4 C (2 F). Calibration is done at more than 2/3 of the instrument measurement range, like 1400 C(2552 F). Adjust the blackbody to 1400 C, set PM716 to two-color mode and compare the temperature of the blackbody with the displayed temperature. Adjust two-color span coefficient and make them equivalent. Two-Color Zero-Point Compensation Coefficient Setting range is ~ +1.00, default <±0.10. Set the Two-Color span coefficient first. Two-Color zero-point compensation coefficient is applicable for the instrument s lower limit temperature measuring section, such as 710 C (1310 F). Set the instrument to Two-Color mode and compare the temperature of the blackbody with the displayed temperature value. Adjust Two-Color zero-point compensation coefficient and make them equivalent. 5.5 Communication Digital output: Format: ASCII, RS232, 9600 baud, 8 data bits, one stop bit and no parity check. Data Transmitting Format 11:25:55 Space 07/10/12 Space R1200C Space 2C HH:MM:SS MM/DD/YY Real-time temperature, Use C for C, Use F for F 2C = Two-Color mode, 1C = One-Color mode No.1 ~ 8 No.9 No.10 ~ 17 No.18 No.19 ~ 24 No.25 No.26 ~ 28 Space AVG1200 Space S1.00 Space NAL No.2 9 Average value 1200 C, the unit is the same as real-time temp. AVG Average value, MAX Max value, MIN Min value. S1.00 Two-Color slope coefficient, E0.95 One-Color emissivity coefficient NAL =No alarm HAL =Hi alarm LAL =Lo alarm No.30 ~ 36 No.37 No.38 ~ 42 No.43 No.44 ~ 46 P a g e 16

18 Space PMP-716 Space SN1000 CR LF Name of internal instrument Serial number of instrument No.47 No.48 ~ 54 No.55 No.56 ~ 61 No.62 No Notes 6.1 Environmental Temperature and Humidity Operating ambient temperature 0 ~ 50 C (32 ~ 122 F) Humidity 10 ~ 95%, no condensation Built in temperature compensation 0~50 C (32 ~ 122 F) Deviation for readings at 23 C: One-color mode <3 C (5 F) Two-color mode <6 C (11 F) 6.2 Maximum, Average and Minimum Sampling Maximum (Peak) Value Temperature Measuring Method The holding time of a Maximum value can be set through the buttons on the back of the unit. The instrument will hold and display the Max value of varying real-time value in a selected time interval Δt. Application: For measuring moving targets (such as steel plate or steel wire). Examples: The steel wire is vibrating; or liquid metals when highest temperature is required. P a g e 17

19 Average value temperature measuring method The average time duration can be set through the controls on the back of the unit. The instrument will calculate and display the average value of the varying real-time value in a selected time interval Δt. This first-order RC calculation can reduce the variation of temperature. Application: Ideal for most field applications or if there is scale or oxidation present. Minimum (Valley) Value Temperature Measuring Method The sampling period of Minimum value can be set through the buttons on the back of the unit. This method functions similarly to the Maximum Method, but holds the minimum value instead. Application: Measuring surface temperature of liquid metals when lowest temperature is required. P a g e 18

20 6.3 Emissivity of Materials Material Emissivity Table Material and Status Temperature Scope( ) Emissivity(about 1μm) Steel: Polished without oxidation Polished with slight oxidation Roughened without oxidation Roughened with slight oxidation Serious oxidation Liquid state Cast iron: Polished without oxidation Polished with slight oxidation Roughened without oxidation Roughened with slight oxidation Serious oxidation Liquid state Stainless steel: Smooth surface Oxidized through a temperature over 800 Copper: Smooth slight oxidation Serious oxidation Liquid state 100~ ~1200 room temperature~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~0.25 Iridium Uranium Hydrargyrum (liquid state) Cobalt: Polished without oxidation 0.25 Polished with slight oxidation Polished with serious oxidation 100~ Roughened without oxidation Roughened with slight oxidation ~0.6 Roughened with serious oxidation 0.7~0.75 Nickel and its plate: Polished without oxidation Polished with slight oxidation Polished with serious oxidation 0.8~0.9 Roughened without oxidation 100~ Roughened with slight oxidation 0.5 Roughened with serious oxidation 0.8~0.9 Black nickel oxide 500~ ~0.9 Bismuth 0.34 Silver and Silver Plate Plate: Roughened without oxidation Roughened with slight oxidation Tungsten Belt roughened without oxidation (tungsten ribbon lamp) Magnesium: Roughened without oxidation Platinum: Polished without oxidation Polished with slight oxidation Polished with serious oxidation Roughened without oxidation Roughened with slight oxidation 100~ ~ ~ ~ ~ ~ ~ ~0.2 Roughened with serious oxidation P a g e ~0.5

21 Platinum black 0.95 Tantalum: Polished without oxidation Polished with slight oxidation Polished with serious oxidation Roughened without oxidation Roughened with slight oxidation Roughened with serious oxidation 100~ ~ ~0.85 Palladium 0.33 Stibium 0.5~0.65 Beryllium: Smooth oxidation Brick White firebrick Silicon dioxide brick Illinium Alumina Granularity 1~2 micron Granularity 10~100 micron Economet: (Kermode) Polished without oxidation Polished with slight oxidation Polished with serious oxidation Roughened without oxidation Roughened with slight oxidation Roughened with serious oxidation Carbon Carbon black] Graphite 100~ ~ ~1500 0~1000 0~1500 0~1500 0~ ~ ~ ~ ~ ~ ~ ~ ~ Two-Color Slope Coefficient The slope is the ratio of the radiant energy from two adjacent wavelengths. Since the radiant energy of both wavelengths will change in unison with emissivity, the emissivity factor is eliminated. The following slopes are approximations and will vary with the alloy material and surface finish: For measuring the following oxidized surface metal materials, the slope is approximately 1.0. Cobalt Stainless steel Nickel Iron Steel For measuring the following metal materials with smooth, clean and non-oxidized surface, the slope is approximately Cobalt Stainless Steel Nickel Rhodium Cast Iron Tungsten Molybdenum Steel Tantalum Platinum P a g e 20

22 Unknown slope: To measure the temperature of other articles or materials, the slope can be set according to the following steps: Use a trusted contact pyrometer or temperature probe to measure the temperature of the target surface. Use average value mode of the pyrometer to measure the temperature on several locations of the target. Adjust the slope of the pyrometer until the reading value equals the temperature of the measured object. 7. Maintenance 7.1 Regular Maintenance Regular attention to the following will ensure steady operation of the sensor: Lens Cleaning- Routinely check the PMP-716 lens glass for dust or oil residue. When necessary, clean the glass with alcohol and lens paper or soft cloth. Calibration- Occasional calibration (see Section 5.4) will ensure that the accuracy of the PMP-716 Pyrometer is maintained. 7.2 Returns of the PMP-716 Contact us at ( LOGIKA ) with the Serial Number of your pyrometer before you return the product. If we are unable to solve the problem by phone or , we will then provide you with a return authorization number. Do not return the PMP-716 without an authorization number. If the product is out of warranty, we will provide a repair estimate and then complete the repairs after your approval. P a g e 21

23 8. Dimensions P a g e 22