| Products > Test Equipment |
| General Eastern Optica (Chilled Mirror Hygrometer) |
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| Anders Petersson:
I bought two Optica units on Ebay, for use as stable humidity reference sensors in the lab. Unfortunately neither of them work. Before I start tinkering, does anyone have experience with them? Does anyone have a service manual, the embedded software or the pinout? Nowadays they are marketed by Panametrics: https://www.bakerhughes.com/panametrics/process-analyzers/moisture-analyzers/chilled-mirror-analyzer INTRO: A chilled mirror hygrometer measures the dewpoint by cooling down a mirror until condensation starts to occur. Common humidity sensors instead measure the Relative Humidity. This parameter can be calculated from dewpoint and temperature. |
| Guido_P:
Hello Anders, I've got an OPTICA for the same purpose, too (puchased new from official european seller, it was not easy to obtain a unit). By some times I'm looking for informations about OPTICA, but Until now I didn't find nothing of useful. About my experience with OPTICA I can say only this, I hope it is useful for you: GENERAL EASTERN OPTICA cod. OP-A-I-0-A-A-4-0-0, (built 2018) version with WIN 98 display. At start it boots WIN 98, then it stops, showing the message: jumping to 0X00224CB0 Instrument is rarely used, internal button battery was low, but replacing it the problem remains. The same exact thing had happened about one year ago, it was sent to official european service center, it has been repaired but the origin of the problmem was not clear. I've got an GE/PANAMETRIcS OPTISONDE, too. It is much cheaper and it perfoms exactely the same work of an OPTICA, apart interface and display. Before sending my unit to service center I'm trying to understand how the PC inside OPTICA works and if I can solve the boot problem by myself, but by now I haven't found no useful informations. On the web the only thing I found is this company that is offering repair for this model: https://acmerevival.com/service-repair/ge-general-eastern-opd10ad200-ce-optica-chilled-mirror-hygrometer-1642976358/ Guido |
| Anders Petersson:
For reference -- I could solve the problems with the two Optica units. They have a regular PC motherboard, hidden in the custom enclosure. Now I just need the pinout for the DB25 cable to the humidity sensor. The official reseller quoted me €700 for the cable alone! I also emailed with Guido_P privately and I hope the information is enough for him to revive his unit too. |
| Jerry Garsia:
Connection table of my cable DB15 (Optica) Round (D2) 9 А 1 В 13 С & R 11 D 5 E 6 F 4 G 14 J 8 K 7 L 10 M 2 N empty P, H 12 S 15 T I've got two optica. First one 2011 year with problems with internal GPU. No video signal, but with two more pci ports, so think it is possible to install external videocard. Second (2018) has the same problem as Guido's, tommorow will test all your recommendations Also i have an optisonde (good condition) and two sensors: D2 & 1211H |
| Anders Petersson:
Thanks Jerry, but the D2 sensor uses another cable, which is DB25-to-DB15. The round connector is used for some other sensors instead of DB15. I attach a picture of the two ends the missing cable needs to mate with. I've started reverse engineering the Optica to figure out the pin mapping, but I don't have much time for it at the moment. |
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