Emerson Transmitter 350 Mode D’Emploi

The LTM-Series can be mounted to the side of a 

Magtech LG series level gage using special mounting 

brackets and stainless steel hose clamps.  When 

mounting the transmitter to an LG series gage the 

active sensor region of the probe should fall within 

the centerline of the process connections on the 

gage.  If the transmitter’s deadband region is inside 

the centerline of the process connections the 

transmitter will not output an accurate 

measurement because the active region of the 

probe is too short.  When placing an order for a 

transmitter to accompany an existing gage it is 

important to indicate the style of the gage, the 

temperature, and the center-to-center dimension.  

center-to-center dimensions provided; however a             

re-ranging may have to be performed to match the 

probe to the desired control room specifications.  

See Section 7.1 “Change Range” for more details.

The LTM-Series standalone transmitter comes 

equipped with a ¾” mnpt compression fitting, 

mounted approximately 3 to 6 inches below the 

electronics housing.  The fitting is placed in this area 

to ensure the transmitter is calibrated in the sensor 

tubes active region.  Refer to the standalone 

drawings for a visual description of the transmitter 

features.  Optional configurations are available 

upon request (2” mnpt, flanges, etc…). The 

magnetic float used in the stand-alone unit is 

designed to travel up the sensor tube with the 

change in fluid level.  If build-up of process or 

contaminates should restrict the movement of the 

float, the transmitter sensor tube will have to be 

cleaned or the float may have to be replaced with 

one that has a larger inside diameter.  The floats are 

designed to match the pressure and specific gravity 

for the process being measured and come in various 

materials ranging from stainless to kynar. The 

magnetic float can be changed out at any time to 

accommodate the processes being measured. The 

float stop, located at the bottom of the 

transmitters, can be removed to allow the float to 

slide off the sensor tube.

The basic steps to installing the LTMs are:

1. Inspection of equipment:  Inspect the parts 

that are listed on the packing slip.  Make sure 

nothing appears to be damaged such as a 

broken glass from the level indicator assembly 

(flippers), damaged float, or a damaged 

transmitter.  Please file a claim with the 

shipping company immediately if it is believed 

the shipment has arrived damaged and be 

prepared to provide pictures.

The following is a depiction of damaged probes:

Figure 8.  All damaged sensor probes

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