BABBITT LG SERIES LIQUID LEVEL GAGES INSTRUCTION MANUAL Babbitt International, Inc. P.O. Box 70094 Houston, TX 77270 713-467-4438 Fax 713-467-8736 www.babbittlevel.
Detailed Description The LG Series Level Gage consists of a glass (or polycarbonate) indicator and float chamber, which is mounted directly to the process vessel. Standard gages are normally flanged or coupled to the process vessel, but a variety of mounting styles are available to suit most any vessel or piping requirements. (See Table 1 of the brochure for more details.) Gages are manufactured to meet the exact specifications of the process such as operating pressure, temperature, specific gravity, etc.
FLIPPER/ROLLER INDICATION (OPTIONAL) (Cont.) Flipper assemblies are offered as an option to the standard Babbitt indicator where surging or turbulent levels may cause “de-coupling” problems. They are also more highly visible than the standard indicator. They come with or without the scale in feet and inches. INSTALLATION LG Series gages are securely packed in specially designed crates to provide maximum protection of the glass tube and float chamber during shipment.
IMPORTANT!!!! IF YOU DON’T READ ANY OTHER PART OF THIS MANUAL, PLEASE READ THIS PAGE. IT MAY SAVE YOU TIME, MONEY AND MUCH FRUSTRATION. PLACING THE GAGE IN SERVICE To insure proper operation of the level gage, the following steps should be taken: 1. Make sure that operating conditions (temperature, pressure, specific gravity, etc.) are within maximum rating of the gage. Each gage has a permanent nameplate at the bottom of the scale indicating process specifications, serial number, tag number etc. 2.
REMOVING THE GAGE FROM SERVICE To remove the gage from service, the following steps should be followed carefully: 1. Close the BOTTOM process connection vale to prevent further filling of the gage. Then close the TOP process connection valve to completely isolate the gage from the process pressure. 2. Attach proper vapor collection equipment to the gage vent connection if required. Open the top vent to relieve pressure in the gage and allow air to flow when the bottom drain is opened. 3.
ROUTINE MAINTENANCE (cont.) 6. Check the stainless steel pipe clamps to insure they are tight and adjust the scale holder up or down on the float chamber to make sure the positive zero is correctly positioned. 7. Use a permanent magnet or a magnet tool from Babbitt to attract the red “bird” until it is again coupled to the float inside the chamber. LG SERIES PARTS LIST When ordering replacement parts for Babbitt Gages, the following information is required: a. b. c.
TERMS & CONDITIONS OF SALE 2. TERMS: Net 30 days to approved customers (representatives assume collection responsibility for new accounts at their discretion). Late charges will be added at the rate of 1.5% per month. 3. All shipments will be FOB warehouse (Houston, TX.) Via motor freight, insured. Freight charges will be collected, or prepaid if specified. 4. Because each gage is designed to customer specifications, there will be no restocking option after shipment is made.
MLS-3, MLS-3EX LEVEL SWITCHES DESCRIPTION The MLS-3 and MLS-3EX are electrically the same, the EX version comes with an explosion proof housing with terminal block. The MLS-3 switch is a hermetically sealed Bi-Stable latching reed switch with SPDT Form C contacts. The switch is actuated by the float and latches, thus maintaining the contact after the float continues to rise or fall with level. The MLS-3 is best suited for low power alarm signals. SPECIFICATIONS Deadband: Max. Temperature: .
SWITCH OPERATION/MOUNTING (cont.) The wire leads on the MLS-3 should be terminated using suitable means (wire nuts, Terminal block, etc.) The MLS-3EX are provided with a terminal block inside the explosion proof enclosure. After the switches are mounted and wired, they need to be set to the desired state for rising or falling level as noted previously.
MOUNTING The MLS-9EX are simply mounted to the level gage chamber using stainless steel band clamps. The switch must be originated properly, switch is marked “TOP”. It is adjustable the full length of the level chamber.
ENVIRONMENTAL CONDITIONS Max. Temperature: Min. Temperature: +200°F - 65°F HT Version: +450°F HOUSING Explosion Proof cast aluminum condulet. FLIPPER/ROLLER RETROFIT INSTALLATION & START-UP When flipper indicators are purchased with a Babbitt gage no installation is necessary. However, if the indicator is removed or a retrofit kit is purchased for a gage already in service, the following should be noted: 1.
TROUBLESHOOTING BABBITT LEVEL GAGES Babbitt gages are a relatively simple to install and use. The following troubleshooting tips may be of help during installation and startup but reading the entire manual helps even more. 1. “Float magnetically de-couples from red indicator “bird”. (Note: if bird is de-coupled, it will fall behind nameplate and will not be visible.) If this is a recurring problem, it could be caused by several things, most of them resulting from improper installation of the gage. a.
TROUBLESHOOTING (cont.) 3. “Indicator tube is cracked or broken.” If the glass indicator tube is cracked or broken replacement can be shipped usually within 24 hours after ordered. One of the advantages of the Babbitt gage is the glass is easily replaced without taking the gage out of service or shutting down the process. To replace the glass, loosen the two screws in the PVC or Teflon block located in the top or bottom of the scale assembly, remove the block and slide out the broken glass.
PS-2 PNEUMATIC SWITCH DESCRIPTION The PS-2 is a pneumatic switch designed to control air and natural gas from 15 to 100 psi. The PS-2 is rotary cam activated and incorporates a non-bleed switch. When the float passes, the cam rotates and latches the switch in the open position. This will allow unobstructed airflow. When the float moves back in the opposite direction the switch unlatches and blocks the airflow.
LT-1/LT-2 2-WIRE TRANSMITTER DESCRIPTION The LT-1 Level Transmitter is designed for use with the LG Series Level gage to provide a 4-20mA control signal proportional to level. The transmitter consists of a sensor tube made up of a string of resistors and magnetically operated reed switches. There is a switch and resistor every ½ inch or ¼ inch along the length of the sensor tube. The circuit board containing the resistors and switches may be the same length as the measured range or any portion thereof.
USING FLOAT IN LEVEL CHAMBER (cont.) 4. Place magnet (float) at 100% (or 20mA mark) on sensor tube. Adjust P3 to read 20mA on 24 VDC current Loop. 5. Repeat Steps 3 and 4 if necessary until transmitter is reading 4mA to 20mA. 6. Check 50% (12mA mark). Clamp the sensor back on the gage chamber loosely and slightly higher than it should be. Make sure the float in the chamber is in the zero position. Slowly adjust the sensor tube downward until the output goes to 4mA.
MULTIPLE TRANSMITTER For multiple transmitter setup using single power supply make sure you have a 24 VDC regulated power supply and refer to figure 1.2 for wiring.
