Battery Replacement; Internal Battery Replacement - Hach Surveyor 4a User Manual

Maintenance & Calibration
Display Description
The elapsed time from the beginning of the charging event. Charging stops when Δt exceeds approximately three
Δt
and a half hours.
Vpeak The maximum voltage at any time during the charging event.
–ΔV The negative change of voltage (Vpeak minus current voltage reading). Charging stops when –ΔV exceeds 60 mV.
The change in temperature from the beginning of the charging event to the current time. Charging stops when
ΔTCO
ΔTCO exceeds 15 °C.
Init Initial readings when the charge event was started.
Current Current reading.
Parameters Time, temperature, voltage (Volts), and battery charge capacity (%)
6. The Surveyor 4a will display "Charging Complete! Disconnect Charger for Normal Operation.
Note: Charging is not complete when ETTC=0 or IB%=100. Charging is complete when Δt equals or exceeds
three and a half hours, –ΔV equals or exceeds 60 mV, or ΔTCO equals or exceeds 15 °C.
7. When IBP is fully recharged, disconnect the Surveyor 4a charge cable. The Surveyor 4a

5.3 Battery Replacement

5.3.1 Internal Battery Replacement

CAUTION
To prevent damage to internal components, avoid placing the battery next to a
water source.
Replace the batteries on a clean, dry working surface.
1. Disconnect any cable connections to the Surveyor 4a.
2. Turn the Surveyor 4a upside down on the working surface.
3. Unscrew the four retaining screws with a Phillips screwdriver. Do not pull the screws
4. Lift and remove the back panel from the bottom of the Surveyor 4a.
5. Remove the old batteries from the compartment.
6. Insert the new battery, aligning the notches on the battery with the notches on the Surveyor 4a
7. Lightly coat the o-ring around the battery compartment with silicone grease. Do not use any
8. Place the back panel over the battery compartment and screw the retaining screws. Do not
Battery Replacement
Page 26
Table 3 All Stats Information
Press any key..." when the charge event is complete.
screen will display the NoConn message.
completely out.
case.
other kind of grease.
overtighten the screws.