FIEDLER H531 Manuel utilisateur

Level measurement in

wells, boreholes,

tanks and sumps

Level gauge H531

user manual version 1.03

H531 level gauge assembly

User manual

electronics for ecology

FIEDLE R

H531 level gauge assembly

User manual

FIEDLE R electronics for ecology

1. SAFETY INSTRUCTIONS 4

2. USING THE LEVEL GAUGE 5

3. QUICK INSTALLATION OF THE LEVEL GAUGE 6

3.1.1. INSTALLING THE LEVEL SENSOR 6

3.1.2. INSTALLATION OF THE DISPLAY UNIT 7

4. BASIC DESCRIPTION 8

4.1. LEVEL SENSORS 8

4.1.1. ABSOLUTE LEVEL SENSOR 9

4.1.2. PRESSURE COMPENSATED LEVEL SENSORS 10

4.2. H531 IMAGING UNIT 12

4.2.1. DESCRIPTION OF H531 CONTROLS AND CONNECTIONS 12

4.2.2. POWER SUPPLY FOR THE LEVEL GAUGE 13

4.2.3. DESCRIPTION OF TERMINALS AND CONFIGURATION JUMPERS OF THE H531 UNIT 14

5. INSTALLATION 15

5.1. MECHANICAL INSTALLATION 15

5.1.1. INSTALLATION OF THE TSH27 ABSOLUTE LEVEL SENSOR 15

5.1.2. INSTALLATION OF A PRESSURE COMPENSATED LEVEL SENSOR 16

5.1.3. EXTENSION OF THE CONNECTING CABLE 16

5.1.4. INSTALLATION OF THE H531 DISPLAY UNIT 17

5.2. ELECTRICAL WIRING 18

5.2.1. CONNECTING THE LEVEL SENSOR TO THE H531 UNIT 18

5.2.2. CONNECTING AN EXTERNAL POWER SUPPLY TO THE H531 19

5.2.3. CONNECTING A RELAY OR OTHER POWER ELEMENT TO H531 20

6. PARAMETERS 21

6.1. H531 LEVEL GAUGE PARAMETERS 21

6.1.1. PARAMETER DISPLAY 21

6.1.2. STRUCTURE OF THE H531 MENU 22

6.2. PARAMETER EDITING PROCEDURE 23

6.3. BASIC FACTORY SETTINGS OF THE H531 LEVEL GAUGE 25

6.4. DESCRIPTION OF INDIVIDUAL H531 PARAMETERS 26

7. REMOTE ACCESS 40

7.1. ARCHITECTURE OF THE DATA ACQUISITION SYSTEM 41

7.1.1. ACTIVE STATION SYSTEM 41

7.1.2. DATA SERVICES 41

7.1.3. CLOUD SERVICES 41

7.1.4. DATAHOSTING AGGREGATE SERVICE 41

7.2. LEVEL GAUGE H531-G 42

7.2.1. GSM/GPRS TECHNOLOGIES 42

7.2.2. ANTENNA 42

7.2.3. PARAMETERS OF THE H531-G LEVEL GAUGE 43

8. TECHNICAL PARAMETERS 44

CONTE

NTS

H531 level gauge assembly

User manual

electronics for ecology

FIEDLE R

1. Safety instructions

•The installation of a level gauge with external power supply must be carried

out by a person with the necessary qualifications for the installation of elec-

trical equipment. The installer must carry out the installation in accordance

with all instructions, regulations and standards relating to safety and electro-

magnetic compatibility.

•If a malfunction of the level gauge could result in a risk to the safety or health

of persons or serious damage to property, independent measures must be

taken or additional equipment installed to eliminate this risk.

•All connected downstream equipment must comply with the relevant stand-

ards and safety regulations and be equipped with suitable anti-interference

filters and surge protection.

•Do not use in explosion hazardous areas!

•Do not use in areas of excessive vibration.

•The manufacturer is not liable for damages resulting from improper instal-

lation, improper maintenance or use contrary to the recommendations in

the operating instructions.

If an external power supply is used, it must meet all safety standards and be

appropriate for the environment in which it will be operated.

Connect the binary transistor output for switching a relay, solenoid valve or

light or sound signal only when the supply voltage is disconnected.

When installing a submersible level sensor, make sure that the maximum

measuring range of the sensor is not exceeded even at the maximum possi-

ble water level.

H531 level gauge assembly

User manual

FIEDLE R electronics for ecology

2. Using the level gauge H531

The battery-powered H531 level gauge assembly consists of the H531 display

unit itself and a submersible level sensor. The assembly is designed for level

measurement in rainwater tanks, cisterns and tanks, wells or boreholes.

The assembly can be used wherever the measuring range and accuracy of the

type of sensor used is suitable and where long-term archiving of the measured

values is not required (the H531 unit does not provide a datalogger function).

The H531 level gauge also includes a binary output controlled by the actual

measured level and therefore the level gauge assembly can be used, in addition

to displaying the level, for simple control of a pump or solenoid valve based on

user adjustable parameters.

The measured level height can be transmitted via the internal communication

module to the database on the server via GSM/GPRS or NB-IoT network (H531-

G or H531-N level gauges). The user can then monitor the level remotely via a

web browser. A special server service can also ensure that a warning SMS is sent

when a preset level is reached.

The mechanical design of the H531 display unit with IP66 protection allows the

unit to be placed outdoors directly at a well or rainwater sump. In this case, it is

advisable to avoid direct sunlight on the H531 display unit to prolong the life of

the unit, as UV radiation can cause the plastic materials used to become brittle.

TYPICAL APPLICATIONS

•Monitoring water levels in wells and boreholes

•Monitoring the level in stormwater sumps

•Automatic water supply to the tank

•Blocking the pump in the well from running on empty

•Indication of reaching limit levels

B i n a r y o ut pu t

R e m o te a c c e s s

L o c a t i o n

H531 level gauge assembly

User manual

electronics for ecology

FIEDLE R

3. Quick installation of the H531

3.1.1. Installing the level sensor

From the factory, the level gauge is assembled and set so that when the sensor

is lowered into the measured sump/mud/tank, the H531 display shows the

measured water level above the sensor. The measuring range of the level gauge

is determined by the type of sensor used (0 to 10 m, 0 to 25 m).

For a sensor with a measuring range of 0 to 10 mH2O, without further adjust-

ment of the H531 parameters, the display will also show a level height in the

range of 0 to 10 m, depending on the depth of immersion of the sensor below

the measured water level.

If the level gauge is to indicate the level from the bottom of the measured

sump/cold and the measuring range of the sensor used is greater than or equal

to the maximum possible level in the measured sump/cold, then it is sufficient

to lower the level gauge to the bottom.

In these first two cases, the user does not need to make any changes to the

parameter settings when installing the level gauge.

Measurement by immersion depth Level measurement from the bottom

Param. Delta

L e v e l

m e a s u r e m e n t b y

i m m er s i o n d e p t h

L e v e l

m e a s u r e m e n t f r o m

t h e b ot t o m

H531 level gauge assembly

User manual

FIEDLE R electronics for ecology

If the level gauge is to display the level from the bottom even if the measuring

range of the sensor used is less than the maximum possible level in the meas-

ured sump/well (third case in the previous figure), then it is necessary to correct

the measured level with the Delta parameter. The numerical value of this pa-

rameter will be permanently added to the measured level height in the H531

unit. It is clear from the principle that the displayed level height will never fall

below the value of the Delta parameter in this case.

The approach to the Delta parameter is given in chap. 3-4-3 Delta on p. 31.

3.1.2. Installing the display unit

The H531 display unit is usually placed close to the measured level. The maxi-

mum possible distance between the submerged transducer and the display unit

is determined by the length of the connection cable between the transducer

and the unit.

If it is necessary to place the display unit

at a greater distance from the measured

sump/cell, then the connection cable can

be extended (see chap. 5.1.3 Extension of

the connection cable on p. 16), or order

an extra length of jumper cable from the

level meter manufacturer.

The mechanical design of the imaging unit

allows it to be placed outdoors, it is only

necessary to protect the unit with a suita-

ble cover from direct sunlight to prevent

gradual degradation of the plastic imag-

ing panel due to UV radiation.

The display unit is factory set to a power

saving display mode, in which the unit's

display wakes up only for a short time af-

ter pressing one of the unit's control but-

tons. The unit is powered by an internal

lithium battery in this mode.

If the level gauge is to be operated in the

mode with permanently switched on dis-

play of the measured level, then it is nec-

essary to connect to the H531 display unit

a source of external power supply voltage of 5 to 28 VDC (see chap. 5.2.2 on p.

19).

The installation of the level gauge is covered in more detail in the chapter 5.

Installation on p. 15.

The installation and commissioning of the level gauges with the H531-G

or H531-N communication module is described in chapter 7-Remote access on

p. 40.

L e v e l co r r e c t i o n

b y D E LTA

p a r a m e t e r

C o v e r ag e f r o m

s u n l i g h t

P ow er s u p p l y a n d

o p e r at i n g m o d e

H531 level gauge assembly

User manual

electronics for ecology

FIEDLE R

4. Basic description

4.1. Level sensors

The submersible transducer converts the pressure applied to the

diaphragm by the transducer into an electrical signal measurable

by the H531 using a strain gauge sensor.

According to the type of measuring sensor used, strain gauge

sensors are divided into:

-absolute sensors

-pressure compensated sensors

The principle of measuring both types of sensors is explained in the following

two chapters.

Absolute sensors do not require a special cable with a compensation capillary

and therefore usually have a lower purchase price. On the other hand, they re-

quire more complex processing of their output signal in the connected display

unit.

The H531 can work with both types of sensors.

The level sensor is usually suspended by a cable above the bottom of the sump,

well or borehole being monitored. However, in some cases, instead of submerg-

ing the sensor in the monitored environment, it may be advantageous to screw

the sensor into a ½" sleeve located at the bottom of the vessel or sump being

measured.

Each level sensor includes a cable that suspends the sensor and connects it to

the H531 display unit. Since the cable is an integral part of the sensor, the length

of the cable along with the measurement range of the sensor must be specified

when ordering the sensor.

The connection cable is used both for powering the sensor's own electronics

and for transmitting the measured signal from the sensor to the H531 unit.

Pressure compensated sensors require a special cable with a compensation ca-

pillary. Therefore, the purchase price of such a sensor is usually higher than that

of an absolute sensor. This is especially true for sensors installed in deep bore-

holes, which require a long connection cable.

S e n s o r di v i s i o n

S e n s o r l oc a t i o n

S e n s o r ca b l e

C a bl e p r i c e b y

s e n s o r t yp e

TSH27 ab-

solute le-

vel sensor

H531 level gauge assembly

User manual

FIEDLE R electronics for ecology

TSH27 absolute sensor

(without sensor cap)

4.1.1. Absolute level sensor

These sensors use an absolute pressure sensor to measure the water level,

which measures the hydrostatic pressure of the water above the sensor (h) in-

cluding the atmospheric air pressure (atm) and converts the resulting total pres-

sure to an output voltage signal in the range of 0 to 5 V.

The principle of level measurement with an absolute level sensor

In the H531 evaluation and display unit, the atmospheric air pressure separately

measured by the H531 is automatically subtracted from the sensor output sig-

nal. The resulting value, corresponding to the height of the water level above

the sensor, is converted to a numerical value displayed on the H531 LCD.

The absolute pressure measurement principle used allows the sensor to be con-

nected to the H531 level gauge via a standard 3-core cable without the usual

atmospheric pressure compensation capillary. A standard cable without a com-

pensation capillary is easier to handle, can be easily extended if necessary and

is also significantly cheaper than a cable containing a compensation capillary.

ABSOLUTE LEVEL SENSOR TSH27-X/Y (0-5 V output)

The TSH27 is an inexpensive absolute level sensor that does not require a special

cable with compensating capillary. The sensor has a stainless steel body with a

diameter of 27 mm and is 115 mm high including the sensor cap. By unscrewing

this cap, the sensor can also be installed in a ½" sleeve.

TSH27 sensors are available in two measuring ranges:

•TSH27-10/10 or TSH27-10/25

(measuring range 0 .. 10 mH2O, PUR cable 10 m or 25 m)

•TSH27-25/30

(measuring range 0 .. 25 mH2O, PUR cable 30 m)

The TSH27 can be supplied with a different cable length for an additional charge.

The sensors have a measurement accuracy of 2.5% of the range and an output

signal of 0..5 V DC. The H531 unit is factory set to connect this type of absolute

encoder.

TSH27-10/25 sensor with measuring range 0..10 mH2O, cable 25 m.

S e n s o r si g n a l

p r o c e s si n g

U s i n g a c h e a p

c a b l e

E xa m pl e 1 .

TSH27 absolute

sensor (without

sensor cap)

H531 level gauge assembly

User manual

electronics for ecology

FIEDLE R

TSH35 sensor

4.1.2. Pressure compensated level sensors

For sensors with automatic compensation of atmospheric air pressure, a special

cable containing a compensation capillary (tube) is used to supply air pressure

(atm) to the back of the strain gauge diaphragm of the sensor. The sensor then

measures only the pressure of the water itself above the sensor (h) acting on

the front side of the measuring diaphragm, since the air pressure above the wa-

ter level is compensated by the air pressure supplied by the compensation ca-

pillary to the back of the sensor diaphragm.

The principle of level measurement using a pressure compensated level sensor

The deflection of the strain gauge diaphragm caused by the water pressure is

converted into a corresponding electrical signal in the sensor. The output signal

from the pressure-compensated sensor therefore does not contain an air pres-

sure component, as in an absolute level sensor, and is proportional only to the

measured height of the water level (h) above the sensor.

There are many pressure compensated sensors on the market and most of them

can be easily connected to the H531. The following overview lists the 2 basic

types of recommended pressure compensated sensors suitable for connection

to the H531 display unit.

TSH35-10/Y LEVEL SENSORS (4-20 mA output)

Cost-effective pressure compensated level sensor with stainless steel body and

measuring diaphragm. These sensors are suitable for routine level measure-

ments of both domestic and waste water.

The sensor has a current output of 4-20 mA and typical measurement accuracy

is better than 0.5% of the measurement range. The sensor body has a diameter

of 24 mm and a height of 70 mm.

TSH35-10/Y sensors are available in only one measuring range:

0 .. 10 mH2O

The Y symbol indicates the required length of the PUR compensation cable in

metres (10 m and 100 m cables are offered as standard).

TSH35-10/10 sensor with measuring range 0..10 mH2O, cable 10 m.

E xa m pl e 2 .

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