Ammonia level sensor hblt-wire

Introduction

HBLT-wire is a capacitive sensor for level measurement of NH3 refrigerant in industrial refrigeration systems.The sensor has an output signal of 4-20 mA, which is proportional with 0 and 100%.Its output signal is 4 mA for an empty container and 20 mA for a full container.HBLT-wire can be adjusted in length to the current application.The sensor element consists of a 2mm steel wire as well as a Teflon tube.Both parts are provided with a length of 4 m and can be shortened with diagonal cutters or other pliers.HBLT-wire can be used in connection with the HBLT-C1 controller for controlling pumps.

Technical details

• Flexible sensor wire, which is adjustable to a length of 600 to 4000 mm.
• Sturdy and reliable design with a standard 4-20 mA output signal.
• Designed for the refrigeration industry – max. pressure up to 100 bar.
• Split design which makes the sensor easy to install and service. The electronic part can easily be separated from the mechanical part by loosening the threaded union.
• Simple calibration for the specified length.
• Alarm output can be set in a range from 10% to 100%.
• Compact design that minimises shipment costs.
• Can be used for marine applications, since measurement is not affected by contact with the metal surface of the overflow pipe.
• Measures NH3 & HFC refrigerants (R22, R134A, R404A, R410A, R507, R717 & R718).

Specifications

Connection diagram

The sensor can be programmed to either emit a linear signal, which is identical to the tank level, or to regulate a valve for the purpose of obtaining the same level in the tank (float valve).

Drawing

Applications

When using a level sensor for measuring Ammonia in a compact plate and shell heat exchanger or other systems with turbulent conditions, we have new recommendation based on recent experience:

For Stand-pipes with stable conditions (smooth changes in the level):

• Use a HBLT-Wire or a HBLT-A1 rod-style sensor. For Stand-pipes with turbulent conditions 
  (a lot of turbulence, cooking, foaming, liquid from the top):
• Use a HBLT-A1 rod-style sensor, or
• Use only a HBLT-Wire sensor when you have it mounted in an inner guide-tube of e.g. DN25 as
  illustrated. 
  The guide-tube will dampen the turbulence and the foaming and you will have a good 
  measurement.
• If HBLT-Wire sensor is already mounted under these conditions WITHOUT a guide-tube,
  do eventually set the filter time function between 60-120 seconds to dampen the signal from the
  turbulent conditions. For tank/drum installation:
• Use a HBLT-A1 rod-style sensor, or
• Use only a HBLT-Wire sensor when you have it mounted in an inner guide-tube of e.g. DN25
  as illustrated. The guide-tube will dampen the level and the foaming and you will have a good 
  measurement.
• If HBLT-Wire sensor is already mounted under these conditions WITHOUT a guide-tube,
  do eventually set the filter time function between 60-120 seconds to dampen the signal from 
  the turbulent conditions.

For Alpha Laval U-turn evaporator:

• Use a HBLT-A1 rod-style sensor.

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