Hach 1720D/1720E Turbidimeter: Complete Guide to Water Quality Monitoring Systems
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This record shows four replacement lamp assemblies associated with Hach 1720-series instruments, rather than four complete turbidimeters. The cartons are branded DONAR and labelled DN-61121, 6.5V–2.75A, with HACH 1720-C/D/E application wording. The entry dated 16 March 2026 describes four new original units, but the photographed packaging does not establish Hach OEM manufacture. No warranty period is stated.
Identification and delivery details
All four lamps appear together with clear glass bulbs, circular metal mounting flanges, paired white leads and white two-contact connectors. Four individual cartons are also pictured. These views agree with the recorded four-piece quantity. They show lamp assemblies only: no instrument body, sample chamber, detector or controller is included.
The 6.5 V and 2.75 A values are carton-label specifications and agree with the supply entry. They are not ratings read from a complete 1720D or 1720E instrument plate. The package calls the product a halogen lamp and gives the DONAR reference DN-61121. Its generic STAGE & MOVIE LAMP wording coexists with the separate Hach application sticker; neither wording proves installation or optical performance in a particular instrument.
Metal-base discoloration and assembly adhesive are visible in close-ups; the supplier's condition statement remains new original. No country-of-origin marking, lamp-life result, optical alignment report or turbidity calibration is supplied. The original article's broad turbidimeter specifications do not describe the four components actually photographed.
| Item | Evidence |
|---|---|
| Delivered item | Four lamp assemblies with leads and connectors |
| Photographed packaging brand | DONAR |
| Package reference | DN-61121 |
| Application wording on carton | HACH 1720-C/D/E |
| Package electrical values | 6.5 V; 2.75 A |
| Construction visible | Clear bulb; metal mounting flange; paired white leads; two-contact plug |
| Complete turbidimeter included | None shown |
| Condition / OEM evidence | New original in supply entry; Hach OEM manufacture unverified |
| Warranty / origin | Not stated / not visibly established |
| Record date / weight | 16 March 2026; 0.5 kg field |
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Component identity and package ratings come from the photographed lamps and cartons. The supplier original-stock wording is reported alongside the DONAR branding without converting it into an OEM guarantee. No complete instrument or calibration result is documented.
Matching this part
Provide the instrument's complete model and existing lamp assembly photographs. Compare flange holes, bulb geometry, lead length and connector arrangement against this batch.
Verify the instrument's specified lamp part and electrical supply before ordering. Request confirmation of component origin and perform the instrument's required alignment and calibration after replacement; no calibration result is documented here.
Photos and recorded media
Recorded inspection clip. The clip is retained as delivery evidence; no performance measurement is inferred from it.
Related records and products
The STAHL indicator-lamp record documents a different electrical signalling component. It is a separate batch and is not a substitute for these instrument lamp assemblies. Contact KOEED with the instrument and lamp references.
Request this part
Send the full instrument model, existing lamp part, connector photographs and quantity. Confirm DN-61121 fit, origin evidence, condition and any offered warranty.
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Send us the part number or article link — we will confirm price, availability and lead time.
