NRG Global Instruments

A Hydrostatic Level Transmitter (also called a submersible or pressure level transmitter) measures the liquid level by sensing the hydrostatic pressure exerted by the liquid column above the sensor, which is usually submerged at the bottom of the tank or well.

Radar level instruments measure the distance from the transmitter (located at some high point) to the surface of a process material located farther below in much the same way as ultrasonic transmitters – by measuring the time-of-flight of a traveling wave.

The fundamental difference between a radar instrument and an ultrasonic instrument is the type of wave used: radio waves instead of sound waves.

Radio waves are electromagnetic in nature (comprised of alternating electric and magnetic fields), and very high frequency (in the microwave frequency range – GHz).

A Non-Contact Ultrasonic Level Sensor measures the level of liquids or solids in a tank or open environment without physically touching the material. It uses ultrasonic sound waves to detect the distance to the material surface.

This is micro-processor based Donnelly Chute level Transmitter with isolated o/p (4-20 mA), 10nos digital optical o/p and 2 relay control .The instrument is field programmable and user friendly.

In this Instrument user can set sensor sensitivity, sensor level selection, sample delay time and relay set point etc. The user can set level 2-10 then instrument automatically tunes for o/p 4-20 mA and display 0-100%.

The instrument has five settable parameters like rL1,rL2,snt,trl,Lst. The Instrument reads input level in sequence 1 to 10 if misplaced any level then it will not show above levels.

Operations Manual – Donnelly Chute Level Transmitter with Modbus Communication Model M11 NX

Operations Manual – Donnelly Chute Level Transmitter with Modbus Communication Model M11 MAX

Parameters
Snt: Sensor Sensitivity adjustment
Lst: Level Sensor selection (2-10)
Trl: sample Delay adjustment
RL1 and rL2 : Relay set point (0-100)

snt(sensitivity adjustment Parameter)

In this parameter user can set sensitivity of every (1-10 sensor) level sensor through key pad. The sensor value can be set in this parameter 93(Max.) to (185min.) sensitivity and it is normally set 100 value of every sensor.

If snt set 93 then i/p led direct on without input connection.

Lst(level selection parameter)

The user can be set input level 2-10 then instrument automatically tune for o/p 4-20 mA and display 0-100%

Trl = 20 set
rL1,rL2 : Relay set point value

Terminal Details
S1 to S10 : i/p for probe type level sensor
GND : Common terminal of probe sensor (Donnelly chute sensor)
L1 to L10 :o/p for isolated digital out put to plc
+24vdc : +v common (+24 vdc) for plc digital i/p
O/p 4-20 mA : mA output (isolated)
P : common terminal of Relay
N/O : Normaly open terminal of Relay
N/C : Normaly close terminal of relay
L : Phase of 220v AC @50/60Hz
N : Neutral
E : Earth

Specifications

Main (auxiliary supply) : 220vAc +-15% @50 Hz
O/P (Analog) : isolated 4-20mA
O/p (digital : isolated digital output (L1 to L10)
Relay set value : 000-100 settable
Display range : 0-100% according select sensor level (2-10) settable
Time delay setting : 001-100 ms settable
Input :10nos. Probe sensor (digital i/p)
Digital i/p / o/p : Indicate by LED as fitted on the front panel
LED : Red Led for i/p, Green Led optical digital o/p
Control Relay : one pair normally open potential free contact: @ 5A at 240v AC
Overall size : 96x194x223 mm (WxHxD )
Panel cutout : 184X92mm(HxW)

Configuration

1st press both PRG+ DN key for 5 seconds then display rL1 press ENT key

display last load value if change then Use up/dn key and press ENT key

display rL2 press ENT key display last load value if change then use up/dn key And press ENT key

display snt press ENT display 001(it means level 1 select to adjust sensitivity) press ENT

display last load value of sensor 1 sensitivity , if you want change value then use up/dn if value decrees (it means sensitivity higher side(93 max.) ) if value increase (it means sensitivity lower side(185 min.) if you want to store modified value then press and hold PRG key after press ENT key now release both key now modified value has been stored .

If you do not want to change in this parameter then use only ENT key, if press only ENT key it means by pass snt parameter, if press PRG key and ENT key it means modified value stored and display snt for next level sensor sensitivity calibration And same process apply for level 1 to level 10 after that, Next parameter Lst display press ENT key display last level select if change (2-10) then use up/dn key press ENT key display trL press ENT key display last value and set 20 and press ENT key and now exit configuration mode.