Instantel Minimate Pro Series - 10.3. Series IV Sensor Specifications; 10.4. Installing an ISEE or DIN Geophone

10–2 Minimate Pro Operator Manual
10.3. Series IV Sensor Specifications
SPECIFICATION
SERIES IV SENSOR
DIN Geophone
ISEE Geophone
ISEE Linear Microphone
Part Number
720A2002 (315 Hz), or
720A2003 (80 Hz)
720A2001
720A1801
Frequency Weighting
N/A
N/A
Linear
Response Standard
DIN 45669-1 Class 1
ISEE Seismograph Specification
ISEE Seismograph Specification
Operating Frequency Range
1 to 315 Hz (718A3301), or
1 to 80 Hz (720A2003 for VDV
Record Mode)
2 to 250 Hz
2 to 250 Hz
Sound Range
Up to 254 mm/s (10 in/s)
Up to 254 mm/s (10 in/s)
88 to 148 dB
Resolution
0.0159 mm/s (0.000625 in/s)
0.0159 mm/s (0.000625 in/s)
0.25 Pa (0.0000363 psi), .1 dB
Sensor Density
2.13 g/cc (133 lbs/ft
3
)
2.13 g/cc (133 lbs/ft
3
)
N/A
Standard Cable Length
1.8 m (6 ft)
1.8 m (6 ft)
1.8 m (6 ft)
Maximum Cable Length
1000 m (1094 yards)
75 m (250 ft)
75 m (250 ft)
Weight
2 lb (.9 kg)
2 lb (.9 kg)
1 lb (.25 kg)
10.4. Installing an ISEE or DIN Geophone
The following sections apply to the Minimate Pro with a Series IV ISEE or DIN Geophone, as
supplied by Instantel. To help differentiate between the two geophone types, the DIN Geophone
has a blue lid, whereas the ISEE Geophone has a silver lid.
The sections illustrate installation procedures recommended by Instantel. Your particular
monitoring activities may employ one or a combination of all of the following procedures. You
may even devise your own method for a specific application. It is important for you to securely
attach the Geophone to the Minimate Pro to ensure reliable monitoring results.
The following sections provide example installation methods. For wall and ceiling installations,
refer to the Reference chapter.
1. Arrow Pointed in Direction of the Event
The arrow on top of the Geophone must be pointed in the direction of the Event to ensure the
geophone sensors, located inside, remain in their natural axis.
2. Level Installation
The Geophone must be level when installed. A leveling plate is available to install the Geophone.
Both the fastening plate and the leveling plate have three leveling feet and an integrated bubble
level indicator.
3. Securely Coupled to the Surrounding Surface
The Geophone must be securely attached to the ground with the provided spikes, or buried. The
surface must be compact with no loose or soft material close to the Geophone. Secure attachment
is critical for reliable and accurate monitoring results. Insufficiently secured, and the Geophone
will move independently of the surrounding surface resulting in distorted, often higher, monitoring
results.
Installation methods depend upon the type of surface. It is up to you to check the surface and
mount the Geophone sufficiently to ensure reliable monitoring results.