66 WTM 502 QUICK-CHECK TENSION METER USER’S GUIDE http://www.cooperinstruments.
TABLE OF CONTENTS 1.0 INTRODUCTION ............................................................................................1 1.1 Unpacking.............................................................................................................. 1 1.2 Description ............................................................................................................ 1 1.21 Front Panel and Keys...................................................................................... 2 1.
1.0 INTRODUCTION = Tip = Remember This manual covers the setup and operation of the WTM 502 Clamp Line Tensionmeter from Cooper Instruments. The WTM 502 is a simple, accurate strand dynamometer. It is can be clamped onto a cable, accurately determine the wire tension and be removed in seconds.
1.2.1 Front Panel and Keys The front panel of the WTM 502 is shown in Figure 2. FIGURE 2. WTM 502 FRONT PANEL Following are descriptions of the keys and their functions: ON/OFF key. Press this key to power up and turn off the WTM 502. ESC key. Press this key to escape an area of the menu or to clear the field when in data entry mode. WIRE key. Press this key to change the wire diameter you are testing with the WTM 502.
Sample display 2. This example shows the wire is a 7/16”, 6X19 stranded cable and the unit of measure is lbf. Place the WTM 502 so the two outside sheaves hang on the wire. Insure that the wire rope is riding in the groove of all three sheaves. See Figure 4. Press the Zero softkey to zero the display 0 should be displayed. 3. 4. Raise the lever arm until it locks in the upright position to apply tension to the wire. Read the line tension on the display.
2.2 Measurement Practices Do not apply tension greater than rated capacity of the instrument or overload damage to the sensor may result. Warning Do not use the WTM 502 with cable larger than indicated on the sheaves. Overload and damage to the instrument may result. Do not mix sheave sizes. This will result in inaccurate measurement and possible overload. For best measurement, install the WTM 502 at least 2 feet (0.6m) from terminations, clamps or other hardware.
2.31 Top Level Softkeys Zero Press this softkey to zero the force display. You would usually press this at the beginning of a series of tension tests but would not need to do it for every test unless there is some zero drift. Clear Press this softkey and you are prompted to clear the Peak reading or the Average. Make your choice by pressing the appropriate softkey and that value is cleared from memory. Mode Press the Mode key to scroll through the five display modes.
To exit the check-tension mode, press any softkey to display the softkey labels, then press the Mode softkey to scroll to the next mode. The next mode is the first mode that was described, live tension mode. Avg Press the Avg softkey to add a displayed tension to the average of other entered readings. Follow the onscreen prompts. Press the Right Arrow key to move to the next set of softkeys.
There is a keypad shortcut for increasing and decreasing contrast. While in normal display mode press the Arrow key and the 2nd softkey simultaneously to increase contrast. Press the Arrow key and first softkey simultaneously to decrease contrast. Blite – Not currently used. About Press this softkey to see the following information: Device – Press this softkey to show a list of information about the WTM 502, such as – serial number, capacity rating, hardware and software revision levels.
3. Use the Num and Adv keys to enter the Config password. Default is 0. After the number is displayed, press the Enter key . . . The following is displayed: The Num keys increment and decrement the displayed numbers. The Adv key moves the cursor to the next digit position. Default Configuration password is 0. If a new password is lost or forgotten, contact Cooper Instruments. 4. The unit is now in the Configuration mode. To see the rest of the softkeys available in this mode, press the Right Arrow key.
Reso Press the Reso softkey and you are prompted to enter a display, or count-by, resolution. Choose from Low, Medium or High. Low resolution provides the best stability and makes the display easiest to read. High resolution provides the finest graduations, but sees greater drift from wire creep and nonrepeatability. If the reading is decreasing over time or differing between measurements on the same line, lowering the resolution will reduce these effects.
Exception: Sheaves match the wire diameter of the cable to be measured and alternate calibration is selected as per section 5.2. Insure that the wire rope is riding in the groove of all three sheaves. Do not use the WTM 502 with cable larger than indicated on the sheaves. Overload and damage to the instrument may result. Do not mix sheave sizes. This will result in inaccurate measurement and possible overload. FIGURE 7 CHANGING SHEAVES 5.0 ACHIEVING BEST ACCURACY 5.
1. No wire calibrations are stored of the same diameter as the wire you are looking to measure, and 2. You do not have sheaves of the same diameter. If both of these conditions exist, contact Cooper Instruments. Contact Cooper Instruments to improve accuracy for a specific wire type by calibrating to it. 5.3 Loading Error A tensiometer works by deflecting the cable, which makes the cable path longer than when a tensiometer is not installed.
Display contrast too light Display is completely dark Display contrast too dark Display drifts downward once installed Wire material is creeping and internal friction between wires is relieved Temperature not accurate Instrument changed temperature environments Instrument exposed to sun Hold the Right Arrow key down while pressing the F2 key several times to increase the display contrast. If nothing occurs, release both keys. Press the power button and try again.
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