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sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - cover

HST
Quick Start Guide

www.sauermanngroup.com

Hygrostat

HST displays alternating humidity and temperature and has a programmable relay with two relative humidity thresholds.

Symbols used
For your safety and in order to avoid any damage of the device, please follow the procedure described in this document and read carefully the notes preceded by the following symbol:
The following symbol will also be used in this document, please read carefully the information notes indicated after this symbol:

Output 1 RCR relay 3 A / 230 Vac. NO (normally open): 5A / NC (normally closed): 3A / 240 Vac. Common mode voltage <30 Vac.
Power supply 24 Vac/Vdc ±10%
Consumption 3 VA
Relay and alarm status Red LED in front and internal buzzer (70 dB at 10 cm)
European directives 2014/30/EU EMC; 2014/35/EU Low Voltage; 2011/65/EU RoHS II; 2012/19/EU WEEE
Electrical connection Terminal block for cables Ø 0.05 to 2.5 mm 2 . Carried out according to the code of good practice
PC communication USB-mini Din cable
Environment Air and neutral gases

Connections

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - Connections

1. Inactive switch
2. Active switch (S1)
3. LCC-S software connection
4. Alarm Led
5. Button for settings
6. Relay terminal block
7. Power supply terminal block
8. Cable gland

Electrical connections as per NFC15-100 standard

This connection must be performed by a qualified and trained technician. To make the connection, the transmitter must not be energized.

NO: normally open
COM: common
NC: normally closed

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - Electrical connections

Settings and use of the transmitter

• Configuration
It is possible to set the unit of the transmitter either by switch and/or via software.
To configure the transmitter, it must not be energized. Then, you can make the settings required, with the DIP switches (as shown on the drawing below).
When the transmitter is configured, you can power it up.

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - Settings and use of the transmitter Configuration by switch: to configure the transmitter, unscrew the 4 screws from the housing then open it.
Please follow carefully the combinations beside with the DIP switch. If the combination is wrongly done, the following message will appear on the display of the transmitter “CONF ERROR”. In that case, you will have to unplug the transmitter, place the DIP switches correctly, and then power the transmitter up. Active switch

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - Settings and use of the transmitter 2

• Units setting – active switch
To set a unit of measurement, put the on-off switch 4 of the units as shown beside.

• Thresholds configuration
The button allows to activate or not an alarm (threshold), to set the action of the alarm (edge), to set the threshold(s) value, to set the time-delay and to acknowledge the alarm.

Working principle:

    • By pressing the button more than 3 seconds, you can validate the setting and go to the next setting.
    • By pressing quickly the button, you can increment a value and scroll down the different option or values.

• Activate or deactivate an alarm

    • Press the button for 3 seconds, “CONF” is displayed then “NEG”, meaning that the relay is in negative security, it is excited during an alarm condition.
    • If needed, press quickly the button to switch the relay in positive security, the relay is de-energized during an alarm condition or a current breaking, “POS” is displayed.
    • Press 3 seconds the button, “Buzz” screen is displayed with “ON” or “OFF” blinking. Briefly press on the button to activate (“ON”) or deactivate (“OFF”) (according to the last saved configuration) the buzzer during an alarm condition.
    • Press the button for 3 seconds, “Alarm” screen is displayed with “On” or “Off” blinking (according to the last saved configuration).
    • Press quickly the button, the display changes from “On” (activated alarm) to “Off” (deactivated alarm).
    • Press the button for 3 seconds to confirm the setting. If the alarm is deactivated, the instrument displays the measurement; if the alarm is
      activated, the instrument displays the following setting.

• Set the action of the alarm (rising edge or falling edge)
The edge determines the action of the alarm according to the trespassing direction of the threshold(s).
sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - icon 5Rising edge (1 threshold): the alarm goes off when the measurement exceeds the threshold and stops when it is below the threshold.
Falling edge (1 threshold): the alarm goes off when the measurement is below the threshold and stops when it exceeds the threshold.
Monitoring (2 thresholds): the alarm goes off when the measurement is outside the defined low and high thresholds.

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - Settings and use of the transmitter 3

Measurement (m) > Threshold (S) during the time-delay T1: alarm activation. Measurement (m) < Threshold (S) – Hysteresis (H) during the time-delay
T2: alarm deactivation.

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - Settings and use of the transmitter 4

Measurement (m) < Threshold (S) during the time-delay T1: alarm activation.
Measurement (m) > Threshold (S) + Hysteresis (H) during time-delay T2: alarm deactivation.

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - Settings and use of the transmitter 5

– Press briefly the button to select the trespassing direction then press the button more than 3 seconds to validate this direction and set the thresholds.

• Set the threshold(s) value
The first digit blinks, it corresponds to the positive (0) or negative (-) setting of the threshold value. Press briefly the button to select the sign for the threshold value. Press the button more than 3 seconds to validate.
The second digit blinks, press briefly the button to scroll the numbers. Press the button more than 3 seconds to validate.
Repeat the process until the last digit to configure the threshold value, validate the threshold and go to the following setting.
If the monitoring edge has been selected, the transmitter displays the setting of the second threshold.

• Set the hysteresis
The hysteresis only concerns the rising edge and the falling edge modes.
In rising edge mode, the hysteresis allows to the transmitter to stay in alarm when the measurement is between the threshold and the threshold minus the hysteresis.
Ex: for a 50% RH threshold and a 10% RH hysteresis, the instrument will stay in alarm when the measurement will be between 50 and 40% RH.
In falling edge mode, the hysteresis allows to the transmitter to stay in alarm when the measurement is between the threshold and the threshold plus the hysteresis.
Ex: for a 100% RH threshold and a 10% RH hysteresis, the instrument will stay in alarm when the measurement will be between 100 and 110% RH.
The first digit blinks, set it pressing the button briefly several times then press on the button more than 3 seconds to set the following digit.. Once the hysteresis is set, press the button more than 3 seconds to validate and set the time-delays.

• Set the time-delay 1 and the time-delay 2 (600 seconds maximum)

    • In rising edge mode, the time-delay 1 corresponds to the time lag before the alarm goes off when the threshold has been reached. The time-delay 2 corresponds to the time lag before the alarm stops when the measurement is lower than the threshold minus the hysteresis. Setting procedure: “Time 1” for the time-delay 1 is displayed then the time in second. The first digit blinks, press briefly on the button and scroll the figures. Press on the button more than 3 seconds to validate. Repeat the process until the last digit to set the time-delay 1 value (from 0 to 600 s) and validate. “Time 2” is displayed the time in second. Repeat the process to set the time-delay 2.
    • In falling edge mode, the time-delay 1 corresponds to the time lag before the alarm goes off when the threshold has been reached. The time-delay 2, corresponds to the time lag before the alarm stops when the measurement is lower than the threshold plus the hysteresis. The setting procedure is the same as the rising edge procedure.
    • In monitoring mode, the alarm of the transmitter goes off when the measurement is below the lower threshold and higher the high threshold. The time delay 1 corresponds to the time lag before the alarm goes off when the measurement is below the lower threshold and higher the high threshold. The time-delay 2 corresponds to the time lag before the alarm stops when the measurement is between the lower and higher thresholds.
      The setting procedure is the same as the rising edge procedure.
      The setting of time delays is done, the measurement is displayed.

Configuration via LCC-S software (optional)

An easy and friendly configuration with the software!
It is possible to configure intermediate ranges.

• To access the configuration via software:

    • Set the DIP switches as shown beside.
    • Connect the cable of the LCC-S to the connection of the transmitter.

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - Configuration

• Please refer to the user manual of the LCC-S to make the configuration.

The configuration of the parameters can be done either with the DIP switch or via software (you can not combine both solutions). Switch off the sensor before settings process.

Mounting
To mount the transmitter, mount the ABS plate on the wall (drilling: Ø 6 mm, screws and pins are supplied).
Insert the transmitter on the fixing plate (see A on the drawing beside). Rotate the housing in clockwise direction until you hear a “click” which confirms that the transmitter is correctly installed.

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - Configuration 2 Ambient model has not any fixing plate.
4 fixing holes are inside the back housing. Use them to install the transmitter on the required location.

Maintenance: please avoid any aggressive solvent. Please protect the transmitter and its probes from any cleaning product containing formalin, that may be used for cleaning rooms or ducts.
Precautions for use: please always use the device in accordance with its intended use and within parameters described in the technical features in order not to compromise the protection ensured by the device.

Accessories

Please refer to the data sheet to get more information about available accessories.

Download the LCC-S software user manual

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - qrhttps://sauermanngroup.com/en-INT/measuring-instruments/transmitters/software/lcc-s

Download the HST data sheet

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity - qr 2https://sauermanngroup.com/en-INT/measuring-instruments/transmitters/humidity-transmitters/hst

Customer service portal
Use our Customer service portal to contact us

https://sauermann-en.custhelp.com
www.sauermanngroup.com

QSG – HST – 08/07/2022 – Non-contractual document – We reserve the right to modify the characteristics of our products without prior notice

Documents / Resources

sauermann HST Hygrostat Instrument for Measuring and Controlling Humidity [pdf] User Guide
HST, Hygrostat Instrument for Measuring and Controlling Humidity, HST Hygrostat Instrument for Measuring and Controlling Humidity

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