Technical Center


FAQS about this product

What kind of external battery should I get to power my Flow32 system?

12 volt 60-80Ahr deep cycle, sealed lead acid battery (see section 1.4 in your Flow32-1K Manual)

Do I need to protect the battery from rain?

Yes, use a ventilated and approved enclosure normally sold at auto part stores. Dynamax sells these enclosures as well.

Can I put the battery and the charger in one enclosure?

If the battery is sealed then yes, but if the battery is not sealed they may not be enclosed together due to the battery releasing hydrogen vapors.

What does the spike on my Dynagage early morning data mean?

Please see section 6.3 in the Flow32-1K Manual.

How do I verify the voltage setting for the Dynagage sensors?

You can use a voltmeter or use the real time monitoring option program which displays the voltage output of the adjustable voltage regulator AVRD on your PC screen.

Do I have to apply the G4 and the Ease release on the surface and does that affect my plants?

 Please see details in section 4.3.3 in the Flow32-1K/Dynagage Manual.

Can I extend my cables?

Yes. You may purchase EXQC Quick Connect Extension Cables to be added to the exsisting EQC-25 ft cables on the system.
EXQC-100 Extra length cable, 100 ft (30.5m)
EXQC-75 Extra length cable, 76 ft (22.8m)
EXQC-50 Extra length cable, 50 ft (15m)
EXQC-25 Extra length cable, 25 ft (7.6m)
DYN191 Replacemnt male 7-pin connector for EQC-25 Cables
DYN192 Replacemnt female 7-pin connector for Dynagage

What do I use as a TC gap for the micro 2mm and 3mm sensors?

Use a gap value of (1). SGA2, and SGA3 have one TC differential reading only (one pair), and therefore it assumes Qv=0, however to maintain similar software support for all sensors, one must enter something as the dX gap. Use 1.0 mm as the default, and the usual sap flow calculation will work.

I have readings of -9999, whats wrong?

As with any delicate instrument, there is the possibility of wear and tear on the components causing breakage. Usually the signals at the datalogger will indicate all -9999, or provide the outside range indicator when there is an open circuit in a connection. The best diagnostic procedure is to first check the wiring to the datalogger and then the connecting cable. Tighten the terminal screws with the small screwdriver provided with your logger usually fixes the problem. Physically inspecting the wires to the screw terminals and giving them a firm tug will confirm the soundness of the lead wire connection.

How do I check the Dynagage cable?

The connecting cable can be tested by a Volt-Ohm Meter (VOM). Remove the gauge from the connecting cable. Place the VOM in the resistance mode (1k Ohm or less). Attach one VOM test lead to each male prong on the end of the cable, and then touch the other end of the exposed cable wire that corresponds to the male prong. Note that the orange and red leads (Vin (+) and Vsense(+)) in the EQC-xx cables, eight conductor extensions, are connected together at the connector as well as the black and yellow leads (Vin (-) and Vsense(-)) The resistance from the connector to the free end of the cable should be .2 to 2.5 Ohms depending on the length of the cable.

How do I diagnose a Dynagage problem?

1st - How do I check the Heater?
A. A digital VOM on the 200 Ohm setting is the best for verifying the internal resistances. Touch the two probes of the VOM firmly to the female D and E terminals. There are letters embossed on the connector to identify the correct leads. D and E are the heater leads, and the resistance should equal the value given on the serial number tag within ±1 unit of the least significant digit. If there is an open circuit, infinite impedance, then the heater is broken. If broken please contact Dynamax at 281-564-5100 (1-888-396-2628 toll free in the US and Canada) to get a Return number to send the sensor in for repair.

2nd - How do I check the thermopile (C terminal reference to H)?
A. Next, test the C and H terminals. C-H is the radial thermopile and its resistance should be between .9 and 3.6 ohms, depending on the gauge size. If this circuit is open, there is a break in the thermopile wire. If broken please contact Dynamax at 281-564-5100 (1-888-396-2628 toll free in the US and Canada) to get a Return number to send the sensor in for repair.

3rd - How do I check the thermocouples A and B reference to H?
A. The resistance at between A and H should be about 1/3 to 1/2 of the thermopile reading, between 0.4 and 1.7 Ohms. Finally check between the B and H terminals, which should also be about 0.4 to 1.7 Ohms. If either of the A-H or B-H wires are open, factory repair is possible. If you are not sure of getting a firm contact with the female terminals, insert a resistor lead wire or any other solid wire into the socket pins desired and then measure the resistances. If broken please contact Dynamax at 281-564-5100 (1-888-396-2628 toll free in the US and Canada) to get a Return number to send the sensor in for repair.

Generally, if only one of the above problems is found, the gauge can be effectively repaired. If more than one problem is discovered, it is usually because of severe corrosion or a burned up unit caused by shorting of several electrical components by complete saturation in water during power-on. There is usually no economical repair possible.

How do I check the heater resistance on my Dynagage?

You will need a voltmeter to check the resistance between pin “D” and pin “E”. The correct value for the heater resistance is on the serial number tag for the sensor.

12 volt 60-80Ahr deep cycle, sealed lead acid battery (see section 1.4 in your Flow32-1K Manual)

The number depends on the size of the gages used. The total current used by the sensors must not exceed 5 Amps per an AVRD channel. Refer to the Solar Calculation Chart to find out how many Amps are needed. Enter the number of sensors of each particular type in the spreadsheet, and then the total amperage is computed in cell 18F.