HB Products HBLT-A1 Quick Manual

Quick guide
HBLT-A1
LIQUID LEVEL
TRANSMITTER
for measuring liquid level
in refrigerant vessels

Introduction and function

HBLT-A1 capacitive liquid level transmitters used to measure liquid levels in refrigerant vessels

Transmits an active 4-20 mA signal proportional to the liquid level

Electronics converts the measured change in capacitance to a signal in proportion to the level

Factory calibrated for R717 (NH
This 'quick guide' only highlights the use of the HBLT on R717 (NH
For all other refrigerants and full documentation please review the
'instruction manual' available online www.hbproducts.dk/documentation.asp

Technical data

Supply voltage and load:
24 V AC/DC ±10% (50/60Hz), 1.5 W
Signal output: 4-20 mA
Liquid refrigerants:
R717 (NH

) (factory setting)

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R22, R404A, R134a, R744 (CO
NOTE! When used in refrigerants with temperatures above +60°C (140°F) (e.g. heat pump applications) a
minimum calibration must be carried out after 1 week of operation. Subsequently a minimum calibration
once a year is needed (see how to do so below).
Factory setting
The HBLT comes factory calibrated for R717 (NH
measuring range. (4 mA when the transmitter does not register liquid and 20 mA when the entire transmitter is
surrounded by liquid).

Setting of refrigerant

For refrigerant: R717 (NH ) it is not necessary to change the settings. The factory setting can be used.
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For all other refrigerants and full documentation please review 'instruction manual' available online
www.hbproducts.dk/documentation.asp

Minimum calibration (0% = 4mA)

1. Apply supply voltage
2. Empty the vessel/standpipe
3. Activate the push button for about 5 sec.
Indication: Control LED lights up (ON). When ready for calibration the LED switches OFF
4. Activate the push button once.
Indication: Control LED flashed once. When green LED flashes normally the calibration is complete.
If calibration button is not activated within 10 seconds, it will automatically leave calibration mode !
Quick guide HBLT - A1 - Liquid level Transmitter (11.08.MK)
)
3
) and R718 (H O)
2 2
), so that it will cover 4 to 20 mA throughout the rod's whole
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Liquid temperature range:
-60/+120°C (-76/+248°F)
Max. working pressure:
100 bar (1450 psig)
Enclosure: IP65
Connection: 4-pole DIN plug
NOTE!
To avoid accumulation
of oil in the stand pipe
a 10deg. slope on the
connection pipe is
recommended.
) systems!
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