This product appears in the Heron Instruments Catalogue 2026
Rolls-Royce
Bureau Veritas
Renouveau La Fontaine
Englobe
National Defence
Government of QuébecOverview
The Heron dipperLog 128+ is an absolute pressure data logger that records groundwater level and temperature in wells and open water, for long-term monitoring, pump tests and slug tests. It stores 128,000 readings, runs up to 15 years on its lithium battery and is built in 316 stainless steel.
- Records water level and temperature: 128,000 readings, downloaded in about 6 minutes
- Water level accuracy ± 0.05 % FS typical (0 to 50 °C), resolution 0.01 % FS
- Temperature ± 0.05 °C typical; sensor meets ASTM E1112 and ISO 80601-2-56, NIST traceable
- Lithium battery: up to 5 million readings or up to 15 years, depending on use
- 316 stainless steel body, PFAS-free wetted materials, IP68
- Overpressure rated to 2 times the factory calibrated range
- Deploys suspended on a cord, on a direct read cable or on a reel
- Measures absolute pressure: compensate with a Heron barLog barometric logger (one per site within 5 km)
The deployment accessories (PC communication cable, suspension cord, direct read cable) and the barLog barometric logger are sold separately. Request a quote for pricing and availability.
Specifications
- Memory
- 128,000 readings
- Download Speed
- 19,200 bps (128,000 readings in about 6 minutes)
- Pressure Ranges (Heron)
- 10 m (30 ft) / 30 m (100 ft) / 60 m (200 ft) / 120 m (400 ft); sea-level ranges
- Overpressure Rating
- 2 x factory calibrated range
- Water Level Accuracy
- ± 0.05 % FS typical, ± 0.1 % FS max error (0 to 50 °C)
- Water Level Resolution
- 0.01 % FS
- Pressure Response Time
- 100 ms
- Pressure Stability
- ± 0.05 % FS per year typical
- Temperature Accuracy
- ± 0.05 °C typical (-20 to +50 °C)
- Temperature Resolution / Range
- 0.0078 °C / -55 to +150 °C reading range
- Operating Temperature
- -20 to 80 °C
- Battery
- Lithium cell, up to 5 million readings or up to 15 years (depending on use)
- Logging Modes
- Linear and predetermined log; immediate or future start
- Wetted Materials
- 316 stainless steel, Delrin, Buna-N (PFAS free)
- O-Rings
- Buna-N primary, Viton secondary
- Transducer
- 316 SS piezoresistive silicon
- Environmental Rating
- IP68
- Dimensions
- 145 mm (5.7 in) long x 22 mm (0.87 in) diameter
- Weight
- 170 g (0.37 lb)
- Warranty
- 2 years
Documents
Calibration and repair
Send it to our Montreal service team. We evaluate the instrument and send a detailed quote before any work starts.
Parts & accessories
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Price on quote
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Price on quote
Compare with similar models
Heron Instruments · Water Level Datalogger| Spec | This model Heron dipperLog 128+ Absolute Groundwater Data LoggerPrice on quote
|  Heron barLog Barometric LoggerPrice on quote
| Heron dipperLog TOUGH+ Titanium Groundwater Data LoggerPrice on quote |
|---|---|---|---|
| Memory | 128000 readings | 128000 readings | 128000 readings |
| Accuracy | ± 0.05 % FS | — | ± 0.05 % FS |
| Battery Life | 15 years | 15 years | 15 years |
Questions, answered
How fast will I get a price?
Send the quote request and a specialist replies within 4 business hours, Monday to Friday, 8:00 to 4:30 ET.
Can we pay on account or by purchase order?
Yes. With established credit, terms are Net 30 days, and you can send your purchase order with the quote request. We also accept Visa, Mastercard and American Express.
How is shipping charged?
On quotes and account orders, freight is F.O.B. Montréal: the carrier charge is worked out at shipment from the packed weight and dimensions, and added to your invoice. In-stock items can also be picked up the same day in Montréal (8605 rue du Champ-d'Eau).
Can I return it?
Yes, within 30 days of purchase, with a return authorization number from customer service first. A 25% restocking fee applies, unless it is a defect covered by the warranty. Special orders, hazardous materials, flammable liquids and gases can't be returned. Return policy
Can ERE calibrate or repair it?
Yes. Our Montréal service shop calibrates and repairs it in-house. Request service
What warranty does it carry?
The manufacturer's warranty applies. The exact terms are in the warranty document. Read the warranty
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