WARNING!
IMPROPER USE OF THESE DEVICES CAN RESULT IN SERIOUS INJURY OR DEATH.
All HS Explorer Computers Out of Stock
Please contact:
Hydrospace Engineering directly for information any additional information.
HydroSpace Engineering, Inc.
Ph: 904-794-7896
For warranty or repair please contact HS Engineering directly.

HS Explorer Model M Trimix Computer with RGBM. The first and only dive computer with full RGBM. 10 in-water selectable gas mixes with almost any combination of N-He-02. The Model M is provided with: Explorer Simulator Software PC interface Cable. The HS Explorer manual and simulator can be downloaded at http://www.hs-eng.com
Open and Closed Circuit Modes
OC Mode: 10 user selectable gas switches
CC Mode: 5 user selectable gas switches in closed circuit and 5 in open circuit (for bailout and oc deco)
Max Depth 600 ft./180M
Physical
Overall Size: 3.25"W x 2.25."H x 1.0" T.
Case Color: Black, Blue,Orange, Green, Yellow or Magenta
Case Material: Non-corrosvie polycarbonate
Mounting: Wrist Strap(s) with buckle.
Display: Liquid Crystal
Display Back Light: LED.
Display Size: 2.50" x 1.50"
Temperature Range: -0ºC to +40ºC.
Operational Pressure Rating: 280 PSI (20 bar) (600 ft, 180 m)
Breathing Mix's: 10, Air, Nitrox, Mixed Gas, Oxygen, Selectable during dive.
Gas Switches: 10 in water selectable mixes in open circuit mode; or 5 in water selectable closed circuit mixes and 5 in water open circuit mixes (for bail out or open circuit deco).
Electrical
Primary Battery: 3.6 volts, lithium, user replaceable.
Temperature Sensor: -20ºC to +50ºC.
Data Storage: 256kb EEPROM.
Recording: Time, Depth, Temperature, Mix Number, Open Circuit/Closed Circut Mode
recorded at 15 second intervals.
LED Display Back Light: User activated by button push.
Serial Interface: (RS-232) compatible.
Decompression Model (Modified Bühlmann, ZH-16)
Calculations
Formula
The calculation formula are based on the work of Dr. Buhlmann with RGBM folding by Dr. Bruce Wienke. Future inclusion of Dr. Wienke's RGBM. Simple models use symmetrical tissue loading/unloading rates (L=U). Complex models use asymmetrical tissue loading/unloading rates (L>U).
Altitude Factors
Altitude Factors
Reference Table 2.2.1 for the pressure reduction values for diving at altitude.
Average Depth
Depth Averaging (dX/dT) computed to first decompression stop.
Breathing Gas Mixes and Dive Protocols
Air: Air, Multi-dive, Multi-day
Nitrox: 21% to 99% NITROX, Multi-dive, Multi-day
Helium: Helium/Oxygen (95%/5% Max He/O2 ratio) , Multi-dive, Multi-day
Multi-gas: Nitrogen/Helium/Oxygen (ref 2.3 for max ratio), Multi-dive, Multi-day
Oxygen: 5% to 100% dependant on usage depth. PPO2 Mix 0, initiates constant PPO2 operation. PPO2 range 0.4 to 1.8.
Calculation Formula Range: 0 - 9 Calculation Formula is diver selectable prior to the dive. Adjustments to the decompression algorithm compensate for factors which increase the risk of decompression sickness. Some of the factors are workload, water temperature, physical condition, age, weight, etc. The conservation factor is recommended by the software interface program after completing the diver profile.
Display Indications

Row 1
DIVE NUMBER: 1 thru 99, Repetitive Dives based on 24 hours time to clear.
DEPTH Icon:
DATE: Day, Month, Year (03/23/98) or (03/23/1999).
BT Icon:
TIME: 24 hour clock (1431).
ND: ND Indicates no decompression requirements
BAT: Indicates Low Battery voltage.
Row 1.5
CEILING: HORIZONTAL ARROW and CEILING are ON when decompression is required.
CEILING numbers have duplicate function to display No Decompression time remaining @ depths > ~30 ft.
VERTICAL ARROW flashes when ascent rate exceeded.
Row 2
DEPTH: Depth in Feet or Meters, Diver Selectable.
BT: Bottom Time in Hours and Minutes, Surface to Surface (ND) or Surface to decompression.
Row 3
MAX: Maximum Depth achieved during dive.
AVG: Average Depth used for computing decompression. Alternately - 0.1 meter depth.
TTS SI TTF: Time To Surface hr : min,. Surface interval, time in hours and minutes , TTF SI alternate at 2 second intervals post dive.
TIME TEMP: Decompression Stop TIME, time to remain at CEILING depth(decompression stop depth), Time To Fly indication, 15 minutes post dive, Temperature, in degrees F or C, diver selectable pre-dive via software interface. These numbers are shared - Temp during ND portion of dive, Decompression Stop time during the Decompression portion.
Row 4
CF ALT: Calculation Formula, 0 to 9, Altitude 0 to 9.
MIX: Current Breathing Mix, maximum 9.
COMP: Diluent Gas Composition, N - Nitrogen, He - Helium, N & He - Trimix %O2: Percent Oxygen in Selected Mix.
PPO2 MODE: Partial Pressure of Oxygen at current depth and Mix, PPO2 mode for rebreather operations.
Simulator Program
Windows 95/98.
Serial Data Port connection to PC.
Main Program External
Program Modules, Factory
Air: Basic Configuration - Air usage only, air decompression.
Nitrox: Second Configuration - Air and Nitrox usage, O2 decompression.
Mixed Gas: Third Configuration - Air, Nitrox, and mixed gas usage, O2 decompression.
Field Programmable Functions
View No-Decompression Limits: based on mix selected for each model.
Date: Set system date .
Time: Set system time.
Mix: 0 to 9
Surface: Set mix compositions. In water, Open Circuit: Select mix to use for computations. In water, Closed Circuit: Select mix to use for computations and change PPO2 setpoint.
CF: Calculation Formula determines calculation and asymmetry algorithm.
Computer Interface Programmable Functions
Date: Set system date .
Time: Set system time.
Mix: 0 - 9
Surface: Set mix compositions, Nitrox and mixed gas units only.
In water: Select mix to use for computations.
Mix 0
Surface: Set mix composition, PPO2 used by rebreather. In water: Mix can be changed 0-4 for constant PPO2 and 5-9 for %O2 conditions.
CF: Conservation Factor automatically changes upward for multi-day diving when initial day is set to other than 0 per original requirement until an CF of 9 is reached.
Dive Data
Dive Log Data
Dive Number.
Dive Date.
Dive Start Time.
Mix Table configuration.
Surface Interval.
Time, Depth, Temperature, Mix Number, Open Circuit/Closed Circut Mode recorded at 15 second intervals.
Temperature indication No-Decompression period only.
Mix changes - Diluent gas mix composition (N, He, NHe or blank for 100% O2 )Oxygen concentration.
Maximum Depth.
Average Depth
Dive Data - Elapsed time in seconds. Open Circuit (OC) or Closed Circuit (CC) mode. Mix Number. Depth
Pre-Dive Program Interface
Input
Set estimated bottom times.
Set estimated average depth.
Set surface respiratory minute volume. (Future addition)
Calculations
Decompression required.
Breathing mix volumes. (Future addition)
Oxygen required for decompression (Future additon)
Decompression Stop Calculations
Depth (ceiling) tolerance at decompression: -1.5 feet (0.5m). Time spent at depths shallower than the indicated CEILING depth is calculated at 1/100th the normal rate. There is no penalty
Time To Surface indication of TOTAL decompression time required to reach the surface plus ascent time.
MSRP = $ 1300 USD
Item: ROC-01-01

HS Explorer - Model O Trimix w/ RGBM
HS Explorer Model O Trimix Computer with RGBM (Reduced Gradient Bubble Modeling) does not include O2 cell, cable or holder
The HS Explorer Dive Computer was designed for simplicity of use and ease of viewing. It is a dive computer that meets the needs of the diving community. A step ahead of other dive computers, the HS Explorer allows the diver to choose either the Buhlmann algorithm or the Reduced Gradient Bubble Model (RGBM) algorithm for decompressions prior to any dive. There are 10 Calculation Formula's (CF's) to use depending on the specific decompression requirements of the dive. The HS Explorer supports both Open Circuit (OC) or Closed Circuit (CC) breathing equipment use to a maximum depth of 600 feet (180m). The HS Explorer supports 10 breathing mixes for use on any given dive. The mixes may be He-O2, He-N2-O2, N2-O2 or O2 for decompression. An important feature of the HS-Explorer is that it can be reprogrammed in the event of program or decompression algorithm updates. There are two models of the HS Explorer Dive Computer, Model M and Model O. The Model O has all the features of the Model M plus the ability to read the Partial Pressure of Oxygen via an O2 cell to determine real-time decompression requirements for rebreather divers. The HS-Explore has all features activated at the time of sale. There are no activation codes or additional fees. There is a free Simulator to allow the diver to become familiar with the HS Explorer and the Simulator contains decompression planning features. The Simulator will upload the dive history and download the mix table from a PC.
MSRP = $ 1400 USD
Item: ROC-01-02

HS Explorer - Model O w/ P-Cell Holder
HS Explorer Model O Trimix Computer with RGBM (Reduced Gradient Bubble Modeling), cable, P-cell holder for existing Draeger rebreather counterlung connector
The HS Explorer Dive Computer was designed for simplicity of use and ease of viewing. It is a dive computer that meets the needs of the diving community. A step ahead of other dive computers, the HS Explorer allows the diver to choose either the Buhlmann algorithm or the Reduced Gradient Bubble Model (RGBM) algorithm for decompressions prior to any dive. There are 10 Calculation Formula's (CF's) to use depending on the specific decompression requirements of the dive. The HS Explorer supports both Open Circuit (OC) or Closed Circuit (CC) breathing equipment use to a maximum depth of 600 feet (180m). The HS Explorer supports 10 breathing mixes for use on any given dive. The mixes may be He-O2, He-N2-O2, N2-O2 or O2 for decompression. An important feature of the HS-Explorer is that it can be reprogrammed in the event of program or decompression algorithm updates. There are two models of the HS Explorer Dive Computer, Model M and Model O. The Model O has all the features of the Model M plus the ability to read the Partial Pressure of Oxygen via an O2 cell to determine real-time decompression requirements for rebreather divers. The HS-Explore has all features activated at the time of sale. There are no activation codes or additional fees. There is a free Simulator to allow the diver to become familiar with the HS Explorer and the Simulator contains decompression planning features. The Simulator will upload the dive history and download the mix table from a PC.
MSRP = $ 1600 USD
Item: ROC-01-03

Model O w/ Cable and Y-Cell Holder
HS Explorer Model O Trimix Computer with RGBM (Reduced Gradient Bubble Modeling), With cable, Y-Cell holder for Inspiration Rebreathers
The HS Explorer Dive Computer was designed for simplicity of use and ease of viewing. It is a dive computer that meets the needs of the diving community. A step ahead of other dive computers, the HS Explorer allows the diver to choose either the Buhlmann algorithm or the Reduced Gradient Bubble Model (RGBM) algorithm for decompressions prior to any dive. There are 10 Calculation Formula's (CF's) to use depending on the specific decompression requirements of the dive. The HS Explorer supports both Open Circuit (OC) or Closed Circuit (CC) breathing equipment use to a maximum depth of 600 feet (180m). The HS Explorer supports 10 breathing mixes for use on any given dive. The mixes may be He-O2, He-N2-O2, N2-O2 or O2 for decompression. An important feature of the HS-Explorer is that it can be reprogrammed in the event of program or decompression algorithm updates. There are two models of the HS Explorer Dive Computer, Model M and Model O. The Model O has all the features of the Model M plus the ability to read the Partial Pressure of Oxygen via an O2 cell to determine real-time decompression requirements for rebreather divers. The HS-Explore has all features activated at the time of sale. There are no activation codes or additional fees. There is a free Simulator to allow the diver to become familiar with the HS Explorer and the Simulator contains decompression planning features. The Simulator will upload the dive history and download the mix table from a PC.
MSRP = $ 1800 USD
Item: ROC-01-04

Model O w/ Open Ended Cable and Bulkhead Connector
HS Explorer Model O Trimix Computer with RGBM (Reduced Gradient Bubble Modeling), open ended cable and bulkhead connector.
The HS Explorer Dive Computer was designed for simplicity of use and ease of viewing. It is a dive computer that meets the needs of the diving community. A step ahead of other dive computers, the HS Explorer allows the diver to choose either the Buhlmann algorithm or the Reduced Gradient Bubble Model (RGBM) algorithm for decompressions prior to any dive. There are 10 Calculation Formula's (CF's) to use depending on the specific decompression requirements of the dive. The HS Explorer supports both Open Circuit (OC) or Closed Circuit (CC) breathing equipment use to a maximum depth of 600 feet (180m). The HS Explorer supports 10 breathing mixes for use on any given dive. The mixes may be He-O2, He-N2-O2, N2-O2 or O2 for decompression. An important feature of the HS-Explorer is that it can be reprogrammed in the event of program or decompression algorithm updates. There are two models of the HS Explorer Dive Computer, Model M and Model O. The Model O has all the features of the Model M plus the ability to read the Partial Pressure of Oxygen via an O2 cell to determine real-time decompression requirements for rebreather divers. The HS-Explore has all features activated at the time of sale. There are no activation codes or additional fees. There is a free Simulator to allow the diver to become familiar with the HS Explorer and the Simulator contains decompression planning features. The Simulator will upload the dive history and download the mix table from a PC.
MSRP = $ 1600 USD
Item: ROC-01-05

HS Explorer 3 Cell PPO2 Meter w/ Cable
HS Explorer PPO2 Meter - Triple Cell Input, open ended cable, no cell holder
The HS Explorer PPO2 monitor was designed to be a simple, easy to use monitor for PPO2 levels when diving with Closed Circuit and Semi-Closed Circuit SCUBA equipment. Calibration requires that the O2 fuel cell be placed in the appropriate calibration gas. The PPO2 monitor features a large easy to read display. The difference between the PPO2-1 and PPO2-3 is the number of O2 cells each will read and display. The PPO2 1 reads one O2 cell and the PPO2-3 reads 3 O2 cells. Calibration is quick and simple. O2 Cell voltages are displayed during the calibration sequence. A 10 minute "ON time" allows for prebreathing. Battery life is approximately 2000 hours.
MSRP = $ 640 USD
Item: ROC-01-06

HS Explorer Single Cell Input w/Cable
HS Explorer PPO2 Meter - Single Cell Input, open ended cable, no cell holder
The HS Explorer PPO2 monitor was designed to be a simple, easy to use monitor for PPO2 levels when diving with Closed Circuit and Semi-Closed Circuit SCUBA equipment. Calibration requires that the O2 fuel cell be placed in the appropriate calibration gas. The PPO2 monitor features a large easy to read display. The difference between the PPO2-1 and PPO2-3 is the number of O2 cells each will read and display. The PPO2 1 reads one O2 cell and the PPO2-3 reads 3 O2 cells. Calibration is quick and simple. O2 Cell voltages are displayed during the calibration sequence. A 10 minute "ON time" allows for prebreathing. Battery life is approximately 2000 hours.
MSRP = $ 550 USD
Item: ROC-01-07