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[Solved] ORNO OR-CR-233 twilight switch switches on too early - how to correct it?

Zapp 4578 10
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  • #1 16379682
    Zapp
    Level 11  
    Hello.
    I don't know if this is the right section, but it seemed the most appropriate, but to the point.
    I have a twilight switch with the ORNO OR-CR-233 probe and the problem is that it switches on when there is a light gray light, and I want it to switch on at least when there is a strong gray light, the potentiometer is already set to the maximum on the moon and I can't do without replacing the elements.
    I've already tried giving resistors in series and in parallel to the potentiometer but nothing helped, in series it was even worse.(The potentiometer is 2.2M) when I put a 10k potentiometer in the detector circuit, this turns it on somewhere around 6-6.5k (the probe seems to be a simple 5-10k photoresistor). Any advice will be useful, and if it doesn't work I guess I'll have to put this "toy" in a box and buy another.
    I am attaching pictures of the circuit.
    ORNO OR-CR-233 twilight switch switches on too early - how to correct it? .
    ORNO OR-CR-233 twilight switch switches on too early - how to correct it?
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  • #2 16380230
    rafal35
    Level 18  
    It is possible that the photoresistor has too little sensitivity and only starts to react when there is more light.You could try inserting another photoresistor.
  • #3 16382354
    Zapp
    Level 11  
    I connected another one, no change.
    The manufacturer states that it is adjustable from 2 to 100 lux, but on mine it switches on at much more....
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  • #4 16386866
    retrofood
    VIP Meritorious for electroda.pl  
    Zapp wrote:
    .
    I've already tried giving resistors in series and in parallel to the potentiometer but nothing helped, in series was even worse.(The potentiometer is 2.2M) when I put a 10k potentiometer in the detector circuit, this turns it on somewhere around 6-6.5k (the probe seems to be a simple 5-10k photoresistor).
    .
    Zapp wrote:
    I connected another one, no change.

    You're contradicting yourself, so something doesn't add up here.
    Let's put it this way, I once made my own twilight switch and experimented with different photoresistors and resistors. And there is no power! If the circuit responds to adding a series resistance, it must also respond to changing a photoresistor. So you are doing something wrong.
  • #5 16394796
    Zapp
    Level 11  
    why am I contradicting myself? I wrote that I was replacing with another photoresistor probably of the same value (I don't know what the original one is but it looks the same as the one I replaced it with) and in the first quote only that by adding a resistor in series with the photoresistor it was even worse (the higher the resistance the faster it turns on....
  • #6 16394890
    Krzysztof Kamienski
    Level 43  
    Zapp wrote:
    the photoresistor was even worse (the higher the resistance the faster it switches on...
    It works correctly. The darker it is, the higher the FR resistance. Connect a 100 k potentiometerΩ parallel to the photoresistor, or tape the field to it with black tape ( no kidding :cry: ) some American twilight switches have an aperture on the FR.
    ORNO OR-CR-233 twilight switch switches on too early - how to correct it?
  • #7 16401375
    Jacek Rutkowski
    Level 28  
    Covering the sensor will cause it to trip even faster. Adding a resistor in parallel to it must desensitise the circuit and delay its switching on. Try as your colleague Krzysztof Kamienski add a potentiometer in parallel to the sensor and adjust the sensitivity.
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  • #8 16426410
    Zapp
    Level 11  
    Well you are just thinking like me.... i also thought that by adding resistance in parallel i would reduce it and thus get better results, except that i only had 1M and 10K but no change.... and nothing changed when turning one and the other still switched almost the same.... terribly strange this Chinese switch but I decided to buy another one because I do not have the strength to fight with this contraption as I am not an electronics expert....
  • #9 16459806
    wieswas
    Level 34  
    Or maybe pre-light the photo resistor with an LED.
    At the 'greyout' it will recognise that it's not quite dark yet and hold off on lighting the lamp. Ultimately, by placing the LED inside the housing, it may be enough to power it with a small current of about 2mA.
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  • #10 16460062
    Łukasz-O
    Admin of electroenergetics  
    wieswas wrote:
    A maybe pre-light the photo resistor with an LED.
    At the "greyout" it will recognise that it's not quite dark yet and hold off on lighting the lamp. Ultimately, by placing the LED inside the housing, it may be enough to power it with a small current of about 2mA.
    .
    A colleague must be joking. I'm already leaving aside illuminating the photoresistor with an LED, which is a curio. What puzzles me, however, is how you put this LED in a flooded hermetic probe and power it.

    A topic perhaps already solved but I will add my three cents.
    Firstly, this company is not top of the range and instead of combining and streamlining, it will be cheaper to replace with slightly more expensive but proven and leading edge ones.
    Secondly, in my opinion, the probe has been placed in the wrong way, in an excessively darkened place.
  • #11 17590255
    Zapp
    Level 11  
    I bought another model(Zamel-WZM01)
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Topic summary

The ORNO OR-CR-233 twilight switch exhibits premature activation under light gray conditions instead of the desired stronger gray light level. The potentiometer is set to maximum sensitivity, but adjustments with series and parallel resistors have not improved performance; adding series resistance worsened the issue. The photoresistor in the probe, estimated at 5-10kΩ, may lack sufficient sensitivity. Replacing the photoresistor with a similar one yielded no change. Suggestions include adding a parallel potentiometer (e.g., 100kΩ) to desensitize the sensor or physically shading the sensor to adjust sensitivity. Covering the sensor accelerates switching, while parallel resistance can delay it. Some propose pre-illuminating the photoresistor with a low-current LED to simulate ambient light, though practical implementation is challenging. The probe placement may also affect sensitivity if located in an overly dark environment. Due to persistent issues and the device's low cost and quality, replacing the unit with a more reliable model, such as the Zamel WZM01, was ultimately chosen.
Summary generated by the language model.
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