XL Series Data Loggers

The WaterLOG XL Series consists of some of our most popular data logger models—the H-522, H-522+, H-350XL and H-500XL. Specifically designed to collect reliable data under extreme environmental conditions, the XL data logger series was made for professionals who prefer the familiarity of the interface across all four models.You'll love the simplicity of the display, allowing programming and configuration without the need to hook up a laptop. And for those of you who prefer to use a laptop,rest assured knowing we've made that option available as well. Whatever your data collecting needs may be, you can rely on the XL Series for accurate, dependable data.

  • Features
  • Specifications
  • Software


The simple, intutitive programming and user friendly display of the H-350XL became the first face of the XL Series. This microprocessor controlled pressure sensor and data logger includes all the features of the H-500XL as well as those of the H-3531 sensor used for a bubble gauge. Combine the H-350XL with our Bubbler (H-3551) and you've got yourself a complete, self containted bubbler system.

H-522 and H-522+

If you're looking for a data logger with a fully integrated HDR transmitter the H-522 and H-522+ are your models. Capable of communicating through GOES, METEOSAT or INSAT satellites, these models are designed for use in remote monitoring applications.  The H-522 and H-522+ allow your to transmit data storage and sensor values to a satellite network for near real-time data retrieval. If you don't have the need for a display, the H-522 is your model, but keep in mind, the H-522+ is our top seller, with close to 6000 units in operation to date.


The H-500XL was designed for sites with existing pressure sensors/bubblers, where an internal pressure sensor was not needed. Like the others in the XL Series, this basic model contains a user friendly display, can communicate with GPRS/GMS modems and other means of communication, and is rugged enough for extreme environments.

Quick SpecsH-500XLH-350XLH-522H-522+
Keyboard Display Yes Yes Yes
Pressure Sensor Optional1 Built-in Optional1 Optional1
GOES/METEOSAT/INSAT satellite transmitter Optional2 Optional2 Built-in Built-in

1 Can interface to the H-3531 external pressure sensor.
2 Can interface to an external H-2221 Satellite transmitter for GOES or METEOSAT; or to an external H-222 DASE (signal engineering) transmitter for INSAT.

Pressure Transducer

(H-350XL only)
Accuracy Less than or equal to 0.02% of full scale output (FSO) over temperature range
Range 0 to 15 psi (0 to 34 ft (11m)); Accuracy = ±0.007 ft (2.1 mm)
0 to 30 psi (0 to 69 ft (21 m)); Accuracy = ±0.014 ft (4.3 mm)
Custom calibration ranges available to 100 psi
Media Compatibility Non-corrosive dry gases only
Analog Inputs
Channels 4 single ended, 1 differential
Resolution 24-bit resolution
Accuracy ±0.02% FS
Range o to 5 V (all channels); 0 to 500 mV (additional on channel 1)
+5.0 Volt Excitation
Accuracy ±5.0 mV over load and temperature range
Current 10 mA max load
Switched +12.0 Volt Excitation
Type Unregulated based on battery voltage
Current 2.5 Amps
Frequency Input
Range 1 to 10 KHz at ±75 mV PP or greater; 1 to 15 KHz at 1 V PP or greater
Amplitude ±5.0 V max
Accuracy ±0.1%x
Counter Input
Type Switch closure or voltage pulse
Voltage Input 0-5 V
Frequency Input 100Hx max
Digital I/O
Channels 2, independently configured for input or output
Input Levels 0.0 to 5.0 volts; (High ≥ 3.5 V, Low ≤ 0.8 V)
Output Levels High = 3.5 V Min Sourcing 5 mA; Low = 0.4 V Max Sinking 5 mA
4-20mA Output
Accuracy ± 0.5% FSO
Type Supports both Master and Slave modes
Connector 3-pin connector
Type 3 RS-232 communication ports
Connector 9-pin D connector, female
Baud Rate Programmable
Data Storage Capacity 256 MB, Non-Volatile FLASH

1 Host USB-A Connector, 1 Device Mini-B Connector; Version 2.0

External Satellite (H-350/H-500)


Keypad Display 1 line 20 character vacuum florescent LED display
PowerH-350 / H-500H-522+
Voltage Input 10.0 to 16.0 V 11.0 to 16.0 V

Standby: 5 mA Max; Active: see manual

Standby: 12 mA Max; Active Transmitting: <2.75 A

Operating Temperature -40 ° to +60 ° C
Storage Temperature -40 ° to +80 ° C
Humidity 100% non-condensing
PhysicalH-350 / H-500H-522+

Housing Size

(L x W x H)

7 in. x 8.5 in. x 4.3 in.

(180 mm x 220 mm x 110 mm)

9.5 in. x 11 in. x 6 in.

(241.3 mm x 279.4 mm x 152.4 mm)

Shipping Weight 4.25 lbs (2 kg) 7.5 lbs (3.4 kg)
Material Fiberglass with clear Lexan® window. Fiberglass (does not have clear Lexan® window)

The WaterLOG® XL Series is warranted against defects in materials and workmanship for twenty-four months from date of shipment.

For detailed specifications, see user manual.

The 4.45 Firmware consists of updates and options for a GOES antenna type, leaving 5.00 volt excitation on all the time, and other miscellaneous cleanup and enhancements. Click here for more detailed descriptions or 'Get Firmware' to access current and archived versions.

H-350 XL Series Firmware — v 4.48 — 01/01/2016

Version 4.48 Summary Of Changes.

  • Added support for the H-2221 INSAT transmitter.
  • Added ability to transmit GOES once a day.
  • Fixed NOAA mode when used with the H-2221 radio.
  • Added enhancement when using H-2221 radio to automatically force it to perform a leapsecond GPS sync once per day.
  • Fixed bugs related to reading external USB drives and SD cards containing long filenames or folder names.
  • Added ability to query SDI-12 sensors using R0-R9 commands.

H-350 XL Series Firmware — v 4.45 — 20May2013

H-500 XL Series Firmware — v 4.45 — 20May2013

H-522 XL Series Firmware — v 4.45 — 20May2013

H-522+ XL Series Firmware — v 4.45 — 20May2013

Get Firmware

Options & Accessories

H-350-PRV (-15,-30,-50)

15, 30 or 50 PSI pressure relief valve


9-pin Female to 9-pin Male


Compact FLASH PC Card Adaptor

H-350-INS (-15, -30, -50)

15, 30 or 50 PSI Install Kit (includes: 6 ft. of 1/8 in. tubing; brass streetT; pressure relief valve; 1/8 in. NPT to 1/8 in. tubing adaptor).


External USB FLASH thumb drive (2 GB)


External SD memory card (256 MB, industrial grade)


Compact FLASH memory card (512 MB)

H-350-DIS (2,4)

2-line remote display, 12 VDC; 4-line remote display, 12 VDC


WaterLOG XL Data Logger Series

XL Data Loggers

WaterLOG began the successful XL Series of data loggers in 2001 with the introduction of the H-350XL. This was followed later that same year by the H-500XL and finally in 2004 with the release of the H-522 and H-522+.