Toshiba LQ500 用户手册

LQ500  

3

 

200 mm (8”) 

8 mS/cm maximum 

250 mm (10”) 

8 mS/cm maximum 

300 mm (12”) 

6 mS/cm maximum 

Note 1: The LQ500 can not have an accurate density 

(consistency) measurement when it is over the 

specification according to reduce the microwave signal. 

Note 2: The LQ500 density (consistency) measurement 

for application where liquids containing highly 

conductive particles such as active carbon and 

metal particles may be affected. Consult 

Toshiba for detail when the measuring liquid 

contains such particles. 

Main pipe 

SCS14A cast (equivalent to 

316 SS) (standard) (*2, *3) 

Temperature detector sheath 

316 stainless steel (*4) 

Applicator window 

Polysulfone (*4) 

Applicator window sealant 

Fluoric rubber 

*1 Avoid using the LQ500 for applications where 

harmful liquids that cause corrosion, deterioration, or 

changes in quantity for the wetting materials are used. 

Make sure all materials at these wetting parts that are 

suitable for your CIP or not before cleaning. 

*2 The smoothness inside the pipe on this material is; 

Type Meter 

size 

Smoothness 

50 to 200 mm  

(1/2” to 8”) 

No buffing 

Standard type 

250 & 300 mm  

(10” & 12”) 

Buffing # 150 

Option type 

50 to 300 mm  

(1/2” to 12”) 

Buffing # 150 

*3 State the wetted materials when you choose these 

options. 

*4 The materials of them are changed for abrasive 

applications. 

Need to choose the specification code for this 

application. 

Serves as an antenna to send

 

and receive  

microwave signals, one set provided. 

Temperature detector: RTD (Pt100) 

Direct fitting to vertical or horizontal  

piping. (Refer to the section of Piping 

Precautions.) 

■ 

4-20mAdc (load resistance 750 ohm maximum, 

isolated output.) 

signal: 125Vac, 0.1A (resistive load) solid 

state contact; opens when an error occurs in the 

converter or when the LQ500 is in the setting 

change mode, otherwise the contact remains 

closed. 

Digital signal is superimposed on 4-20mAdc  

current signal (conforming to HART protocol(*1)). 

Load resistance:240 to 750 ohm 
Load capacity:0.25μF maximum 

*1 HART (Highway Addressable Remote 

Transducer) protocol is a communications 

protocol for industrial sensors recommended 

by HCF (HART Communication Foundation). 

Note:  The optional AF900 hand-held terminal can be 

used to operate the LQ500 from remote places 

by connecting the AF900’s probe lead between 

the LQ500’s 4-20 mA dc output signal lines. 

In order to avoid problems of density 

(consistency) measurement such as 

inhomogeneous condition caused by 

discontinuous process operation and empty pipe 

condition caused by stopping process operation. 

<Specification> 

One dry “make” contact;  

Contact capacity of 24Vdc with 0.1 to 2.0A is 

required. 

This contact signal can be used to start or stop 

density (consistency) measurement in 

synchronization with an external contact, such 

as the contacts on a pump. 

The measurement starts or stops as follows: 

Contact closed: Starts density (consistency) 

measurement. 

Contact open: Stops density (consistency) 

measurement. 

In order to achieve selecting up to 4 kinds of 

liquid concentration measurement independently 

as maximum. 

<Specification> 

Two voltage signals described below are required: 

  Input voltage:  H level:  20 to 30 Vdc 

   

L level:  2 Vdc or less 

  Input resistance:  Approx. 3k ohm 

Need to prepare an additional conductivity meter 

when using this function. Install in where is able 

to have a stable and accurate measurement. 

<Specification> 

  Input signal: 4 to 20mAdc 

  Conductivity range: 0 to 10mS/cm 

Approx. 1 second 

In order to save measurement data into the 

memory of converter temporary.  

The oldest data is overwritten. 

<Specification> 

  Data storage points: 256 points maximum. 

  Period: 1 to 1,800 minutes (1 minute each).  

  ex 1: The data is saved for approx. latest 4.26 

hours when programming every minute. 

  ex 2: The data is saved for approx. latest 21.3